slkvm is an application to provide some system tools to work with clustering and virtualization. It focuses on depending on as few external tools as possible but to also support as many virtualization technologies as possible. It works in a cluster environment where heartbeat runs virtual machines of nodes that have failed. It builds an "unheaded" cluster to avoid having a clear point of failure. It is able to build a two node cluster with everything redundant. It avoids compiling a new kernel or newer version of applications, so you can benefit from Debian security updates.
Countly is a real-time, mobile analytics application. It collects event data from mobile phones and visualizes this information to analyze mobile application usage. Countly dashboard gives a complete overview of your application's performance. You can view detailed metrics, including session length, hardware type, operator (carrier), connection type or speed, activity length, and more.