It is a simple massive realtime ranking server made in C#. It uses CSharpUtils project. It uses a modified version of a RedBlackTree. The RedBlackTree implementation is a port of the D version. The modifications are from an idea I had in order to maintain a tree that can tell you on log(N) time how much elements have a lower or higher value than a specified node. You can read the idea on my blog in Spanish: http://blog.cballesterosvelasco.es/2011/06/rankings-masivos-en-tiempo-real-y.html