CloadAtlas

Cloud Atlas is a distributed system based on paper 
"Astrolabe: A robust and scalable technology for distributed system monitoring, management, and data mining".
The main purpose is to monitor machine statistics in distributed network. Nodes communiates between each other by
gossiping statistics.
There is also a sql-like language for creating queries of accumulated statistics like
SELECT sum(cpu_usage)/count(cpu_usage) AS cpu_usage