I'd like to announce the alpha release of Entanglar, a framework for creating multiplayer games in .Net - aimed at developers of indie games. http://entanglar.dunnchurchill.com Entanglar provides the "spooky action at a distance", entity spawn, destruction, time sync, property sync and synchronised method invocations. It does this transparently, all you need to do is inherit from Entity, and put [Synchronised] attributes on the appropriate properties and methods. Entanglar provides a stable fixed-step timer and integration with Box2DX physics. It doesn't force you into using any particular sound, input or rendering, and these aren't provided. Entanglar uses an inertial error prediction algorithm (which is still being tweaked) to determine which data should be sent to minimise drift in remote simulations.