0 A.D. is a free, open-source, cross-platform real-time strategy game.
LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
X3D Prototypes for the SMUOS Component
Cosmos Tycoon is a open source transport simulation browser game.
starrydb is game server engine
Free strategy browsergame engine.
Minecraft private Skin Center
Modular Minecraft server plugin - commands, events, ...
EPIC is an indepth Multiplayer Strategy RPG Web Game
Game engine and ready browser game Pulsar Online
Studio 1805 Unity MORPG project
Particle Battle is a little online multiplayer real-time strategy Game
Browser based platform for playing CCGs