Zabbix - Track, record, alert and visualize performance and availability of IT resources
Talk360 - Talk360 is a best-in-class communication utility that offers a convenient way to connect with loved ones globally.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
aTalk - An encrypted instant messaging with video call and GPS features for android.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
FluffyChat - Open. Nonprofit. Cute ?