Introducing G2.ai, the future of software buying.Try now

Application Servers

by Preethica Furtado
An application server is a server that hosts applications. Our G2 guide can help you understand application servers and the benefits of using application servers.

What is an application server?

Application server software allows users to install and host applications such as web browsers, image editors, development and testing applications, etc. Application servers grew in popularity when the demand for numerous applications across industries grew. The complexity and additional functionality required by users became tedious to maintain, pushing the demand for application servers.

Application servers can have different users based on their respective requirements. A user might need an application for scalability or to improve managing all their web applications. An application server acts as a middleware platform or the second layer since it exists between the first layer, the client end, which can be a browser or a web server, and the third layer, the database server itself.

Types of application servers

There are three types of application servers:

  • Active application server: This application server supports business logic in the form of rules or objects.
  • Web information server: This type of application server focuses on processing web applications.
  • Component server: This type of application server helps connect different software components.

Benefits of using application servers

A few benefits of application servers include:

  • Instant access to apps: Every application being used is pulled from an application server and delivered by a web server. Web clients make HTTP requests to access a particular app pulled from the application server.
  • Traffic optimization: Application servers are designed in such a way that they can handle high incoming traffic for the apps. Application servers are built to handle multiple requests from web clients. In addition, the performance of heavy applications increases by using an application server.
  • License management: Installing an application every time on a system is difficult. This is where the application server comes in. Computers can run applications without the need to be run locally. This helps in managing licenses for various applications since only the allowed number of users can use the application at a given time.
  • Data integrity: Application servers follow a centralized approach. Any security updates, patches, etc., can be done via the application server. Different users do not need to access the same application and make changes that could cause potential errors.

Application server best practices

In order to make an application server work, there are a few best practices that should be followed:

  • Identifying and prioritization: As a best practice when choosing application servers, it's essential to identify and prioritize based on the wants and needs of the organization/user. Some of the important factors to consider include scalability, reliability, development, performance, and cost-effectiveness, among others.
  • Identification of a use case: If the organization is large to very large, then an application server might be necessary. However, if a smaller organization is looking to purchase an application server, the cost might be their main factor.
Preethica Furtado
PF

Preethica Furtado

Preethica is a Market Research Manager at G2 focused on the cybersecurity, privacy and ERP space. Prior to joining G2, Preethica spent three years in market research for enterprise systems, cloud forecasting, and workstations. She has written research reports for both the semiconductor and telecommunication industries. Her interest in technology led her to combine that with building a challenging career. She enjoys reading, writing blogs and poems, and traveling in her free time.

Application Servers Software

This list shows the top software that mention application servers most on G2.

Red Hat Enterprise Linux (RHEL) is a enterprise operating system designed to provide a secure, stable, and high-performance environment for modern IT infrastructures. It supports a wide range of applications across physical, virtual, and cloud environments, making it a versatile choice for businesses of all sizes. Key Features and Functionality: - Security: RHEL offers live kernel patching, security profiles, and adheres to security standards certifications, ensuring a robust defense against vulnerabilities. - Consistent Lifecycle: The operating system follows a predictable lifecycle with three phases: full support, maintenance support, and an extended life phase, providing long-term stability and planning capabilities. - Cloud Integration: RHEL is optimized for cloud environments and collaborates with major cloud providers like AWS, Microsoft Azure, and Google Cloud, facilitating seamless workload migration and management. - Developer Access: Red Hat provides developers with free access to RHEL through the "Red Hat Enterprise Linux for Business Developers" platform, allowing up to 25 instances for development purposes. Primary Value and Solutions: RHEL addresses the need for a reliable and secure operating system that can handle diverse workloads across various environments. Its comprehensive security features mitigate risks, while the consistent lifecycle ensures long-term support and stability. The integration with leading cloud providers simplifies cloud adoption and management, and the provision of free developer access fosters innovation and accelerates application development. Overall, RHEL empowers organizations to build, deploy, and manage applications efficiently, aligning with business demands for production-readiness and operational excellence.

IBM WebSphere Hybrid Edition is a comprehensive suite designed to modernize Java applications and infrastructure, facilitating a seamless transition to cloud-native environments. It combines traditional WebSphere Application Server offerings with advanced modernization tools, enabling organizations to optimize their existing Java runtimes, operations, and architectures. This integrated approach supports deployments across on-premises systems and major public clouds, utilizing virtual machines, containers, and Kubernetes. Key Features and Functionality: - Versatile Runtime Options: Includes WebSphere Application Server Network Deployment, WebSphere Application Server Base, and WebSphere Liberty Core, offering flexibility to meet diverse application requirements. - Modernization Tools: Features IBM Cloud Transformation Advisor and Mono2Micro, which assist in assessing and transforming monolithic applications into microservices, streamlining the modernization process. - Cloud-Native Development Support: Provides a lightweight, efficient runtime optimized for containerized and Kubernetes-based deployments, facilitating the development of new cloud-native applications. - Flexible Licensing Model: Offers a ratio-based licensing system, allowing organizations to allocate resources effectively across different runtime environments based on their specific needs. Primary Value and Solutions Provided: IBM WebSphere Hybrid Edition addresses the critical need for digital transformation by enabling organizations to modernize their Java applications and infrastructure efficiently. It reduces technical debt, enhances operational efficiency, and supports the adoption of cloud-native architectures. By offering a unified platform with flexible deployment options and robust modernization tools, it empowers businesses to innovate while maintaining the reliability and security of their existing systems.

Eclipse is a robust, open-source integrated development environment (IDE) renowned for its extensibility and support for multiple programming languages. It provides a comprehensive suite of tools for software development, including code editing, debugging, and version control integration. Eclipse's modular architecture allows developers to customize their workspace with a vast array of plugins, catering to diverse development needs. Its cross-platform compatibility ensures a consistent experience across different operating systems. By offering a unified environment for various development tasks, Eclipse enhances productivity and streamlines the software development process. Key Features and Functionality: - Extensible Plugin System: Eclipse's architecture supports a wide range of plugins, enabling developers to tailor the IDE to their specific requirements. - Multi-language Support: It offers support for numerous programming languages, including Java, C++, Python, and more, facilitating diverse development projects. - Advanced Code Editing: Features such as syntax highlighting, code completion, and refactoring tools enhance code quality and developer efficiency. - Integrated Debugging: Eclipse provides powerful debugging tools that allow for real-time code analysis and troubleshooting. - Version Control Integration: Seamless integration with version control systems like Git enables efficient source code management. - Cross-Platform Compatibility: Eclipse runs on various operating systems, including Windows, macOS, and Linux, ensuring a consistent development environment. Primary Value and User Solutions: Eclipse addresses the complexities of modern software development by offering an all-in-one platform that integrates essential development tools. Its extensible nature allows developers to adapt the IDE to their evolving needs, promoting flexibility and scalability. By supporting multiple programming languages and providing advanced features like debugging and version control, Eclipse streamlines the development workflow, reduces context switching, and enhances overall productivity. Its open-source model fosters a collaborative community, ensuring continuous improvement and a wealth of resources for users.

Oracle WebLogic Server is a Java application server that provides a robust, mature, and scalable platform for developing, deploying, and running enterprise applications both on-premises and in the cloud. It offers a comprehensive implementation of Jakarta EE, enabling developers to build and manage applications with ease. WebLogic Server supports deployment on physical machines, virtual machines, and containerized environments, including Kubernetes clusters, ensuring flexibility and adaptability to various IT infrastructures. Key Features and Functionality: - Standards-Based Development: Supports the latest versions of Java SE and Jakarta EE APIs, ensuring compatibility and investment protection. - High Performance and Reliability: Incorporates performance optimizations and self-tuning capabilities to meet service levels with fewer servers and resources, reducing operational costs. - Comprehensive Management Tools: Offers built-in management, diagnostic, and automation tools that enhance operational efficiency. Certified to run on Docker and CRI-O containers, as well as on Kubernetes, both on-premises and in public clouds. - Clustering and High Availability: Provides clustering technology for seamless migration and failover, ensuring continuous operation for business-critical applications. - Integration Capabilities: Integrates with Oracle products and technologies, including Oracle Fusion Middleware and Oracle Applications, as well as various cloud platforms and services, facilitating optimal performance and flexibility. Primary Value and Solutions Provided: Oracle WebLogic Server addresses the need for a reliable and scalable platform for enterprise application development and deployment. By supporting industry standards and offering a rich set of APIs, it simplifies the development process, reduces application complexity, and enhances performance. Its robust management tools and support for modern deployment environments, such as Kubernetes, enable organizations to modernize their applications, achieve greater agility, and reduce time to market. Additionally, its integration with Oracle's product portfolio ensures seamless connectivity and interoperability, providing a comprehensive solution for enterprise application requirements.

IntelliJ IDEA includes an amazing set of tools which work out-of-the-box: support for Maven, Gradle and STS; integration with Git, SVN, Mercurial; built-in Database Tools; and many more.

AWS Elastic Compute Cloud (EC2) is a web service that provides resizable compute capacity in the cloud, making web-scale computing easier for developers.

Oracle Linux brings the latest Linux innovations to market, delivering extreme performance, advanced scalability, and reliability for enterprise applications and systems along with worldwide, enterprise-class, low-cost support. Optimized for enterprise workloads, Oracle Linux is the only operating system to offer zero-downtime updates.

Payara Server is a fully supported, developer-friendly, open source application server. Payara Server's architecture is innovative, cloud-native and optimized for production deployments. The application server, compatible with Eclipse MicroProfile, is built and supported by a team of DevOps engineers dedicated to the continued development and maintenance of the open source software and committed to optimizing Payara Server as the best option for production Java EE applications.

NetBeans IDE. The Smarter and Faster Way to Code. Quickly and easily develop desktop, mobile and web applications with Java, PHP, C/C++ and more. NetBeans IDE is FREE, open source, and has a worldwide community of users and developers.

An application performance management solution that monitors every line of code to help resolve application issues, make user experience improvements, and monitor application performance.

Kemp LoadMaster with advanced load balancing capabilities, LoadMaster ensures the availability and resilience of applications across multi-cloud, hybrid-cloud, and data centers. LoadMaster includes WAF (Web Application Firewall) and authentication and single sign-on capabilities that enhance the security of applications and provide ongoing protection from attacks.

Apache Tomcat is an open-source implementation of the Jakarta EE platform's core specifications, including Jakarta Servlet, Jakarta Pages, Jakarta Expression Language, Jakarta WebSocket, Jakarta Annotations, and Jakarta Authentication. Developed and maintained by the Apache Software Foundation, Tomcat provides a "pure Java" HTTP web server environment for running Java code, making it a robust and reliable solution for deploying Java-based web applications. Key Features and Functionality: - Servlet Container (Catalina): Catalina is Tomcat's servlet container that implements the Jakarta Servlet specification, enabling the execution of Java Servlets. - JSP Engine (Jasper): Jasper is the JSP engine that compiles JavaServer Pages into servlets, facilitating dynamic web content generation. - HTTP Connector (Coyote): Coyote is the HTTP connector component that supports HTTP/1.1 and HTTP/2 protocols, allowing Tomcat to function as a standalone web server. - WebSocket Support: Tomcat provides support for the Jakarta WebSocket specification, enabling real-time, bi-directional communication between clients and servers. - Security Realms: Tomcat includes configurable security realms for user authentication and authorization, enhancing application security. Primary Value and User Solutions: Apache Tomcat offers a lightweight, efficient, and scalable platform for deploying Java-based web applications. Its adherence to Jakarta EE standards ensures compatibility and portability across different environments. Tomcat's modular architecture allows developers to integrate it seamlessly into existing infrastructures, whether as a standalone server or in conjunction with other web servers. Its open-source nature and active community support provide continuous improvements, security updates, and a wealth of resources for troubleshooting and development. By using Tomcat, organizations can deploy robust, high-performance web applications while maintaining flexibility and control over their server environments.

Document management with IBM® FileNet® Content Manager helps you meet the growing challenge of managing enterprise content with greater speed, efficiency and accuracy. FileNet Content Manager is a document management engine that combines enterprise content, security and storage features with ready-to-use workflow and process management capabilities.

WildFly is a flexible, lightweight application server.

Graylog is a unified log management and SIEM platform built to help security and IT teams quickly collect, search, and analyze massive volumes of machine data. It gives organizations real-time visibility across their environments with an intuitive experience, fast search performance, and predictable costs. As a log management platform, Graylog centralizes data from virtually any source and enriches it through pipelines, dashboards, and powerful analytics—helping teams troubleshoot issues, monitor performance, and meet compliance requirements. Its scalable architecture supports deployments of any size across on-prem, cloud, or hybrid environments. Layered on this foundation, Graylog Security delivers modern SIEM capabilities, including risk-based alerting, UEBA-driven anomaly detection, guided remediation steps, and AI-powered investigation summaries. These features reduce noise, accelerate threat detection, and enable analysts of all skill levels to take action confidently. The result: fast time-to-value, operational clarity, and a no-compromise approach to security and observability.

Whether B2C, B2B, department or group: BSI CRM adapts to your business, your processes and your IT environment, and not vice versa.

PuTTY is a free, open-source client program for the SSH, Telnet, Rlogin, and SUPDUP network protocols, enabling users to run remote sessions on computers over a network. It is primarily developed and maintained by Simon Tatham. PuTTY is available for Windows and Unix platforms and includes an `xterm` terminal emulator. The latest version, 0.83, was released on February 8, 2025. Key Features and Functionality: - Protocol Support: PuTTY supports multiple network protocols, including SSH, Telnet, Rlogin, and SUPDUP, allowing secure and flexible remote connections. - Cross-Platform Availability: Compatible with both Windows and Unix systems, PuTTY provides a consistent user experience across different operating environments. - Terminal Emulation: It includes an `xterm` terminal emulator, facilitating the execution of terminal-based applications on remote systems. - Security Enhancements: The latest release, version 0.83, introduces support for ML-KEM, a NIST-standardized post-quantum key exchange mechanism, enhancing security against potential future quantum computing threats. - Unicode Support: Improved Unicode support allows for the use of characters outside the Windows system code page, accommodating a broader range of languages and symbols. Primary Value and User Solutions: PuTTY addresses the need for secure, reliable, and versatile remote access to computers over a network. By supporting multiple protocols and platforms, it enables users to manage and interact with remote systems efficiently. The inclusion of advanced security features, such as post-quantum key exchange mechanisms, ensures that users' connections remain protected against evolving cybersecurity threats. Additionally, its improved Unicode support enhances usability for a global user base, accommodating diverse linguistic requirements.

The Chef enterprise automation portfolio includes 4 workload aligned solutions: Infrastructure Management; Compliance Audit; Application Delivery; and Desktop Management, all solutions are built upon Chef open-source tools: Chef Infra, InSpec, Habitat, Workstation and Automate.

FusionReactor is an Application Performance Monitor for JAVA. No other monitor will help you get to the root of issues faster and make apps more resilient.