Appchkr software is a powerful, user-installed, advanced uptime checking, monitoring, alerting and reporting family of products for applications, databases, networks, servers, and others. The Apppchkrs are focused solely on universal, accurate uptime monitoring for high power without high cost, and for use worldwide. They have heavyweight performance in a lightweight footprint - Light on your network, your budget, and your time. Setup is swift and simple, with no continuing maintenance requirement. The Appchkrs are versatile, ultra-reliable and feature an instant remote access capability from anywhere, with any device. They are capable of extremely short alert latencies, and of monitoring targets on both internal and external networks, which are running on any type of system. The Appchkrs are particularly suited for users who may have a basic need for alerting software now, but expect their need to grow substantially in the future and do not wish to change software as that need develops. Servers, routers, switches, WIFI access points,firewalls, printers and faxes, video systems, and many more may be monitored- any TCP-listening software or hardware system. Choose from among eight types: appchkr, the master type; or networkchkr or serverchkr, the general purpose types; or dbchrk, facilitychkr, securitychkr, smbchkr, testchkr, the specialized, simplified types. Run them on Linux or Windows interchangeably. They are all completely Free Forever for small systems, and not much more for larger ones.