Quasar is a strategy game engine, built in .NET. It uses Mogre for rendering, LuaInterface for scripting, MyGUI for userinterface and OIS for user input.
An editor for the open source game c-evo (http://www.c-evo.org). A suite of several different editors (unit graphics, tile graphics, nation files) with some interoperability. It is written in C# 3.5 using Visual Studio 2010.
Tunnels and Magic is a fantasy turn-based strategic game. You as a grand wizard create and control legendary monsters to overcome even eight other players via Internet or in hot-spot game.