Webhook.site is a tool for building software that not only use webhooks but other types of Internet-based communication, either by allowing developers to inspect the data that's being sent via webhook requests, but also helps create workflows that respond to and interact with webhooks.
When visiting Webhook.site, users instantly get a free, unique, random URL and e-mail address. Everything that's sent to these addresses are shown instantly. With this address, users can test and debug webhooks and HTTP requests. It's what most users know Webhook.site for.
Additionally, Webhook.site sells subscriptions to Basic, Pro and Enterprise packages that come with a suite of cloud services for building Web-based workflows and automations, including Custom Actions (workflow builder that lets you automate, transform and forward data visually or via scripting languages), Schedules and Databases.