A free/open source client and automation tool for Ragnarok Online
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
A game of dungeon exploration, combat and magic
Complete Open Source and Modular solution for MMO
3D game engine with lua scripting
Source code repository of the FreeOrion project
A downloadable game for Windows, macOS, and Linux
A strategy game with a high fantasy theme
99 Nights Script Keyless: Kill Aura, Auto Combat, Auto Craft, & more.
Action RPG that's easy to mod
Hardcore 3D space shooter with spaceship upgrade possibilities.
An enhanced version of 7K:AA (Seven Kingdoms: Ancient Adversaries).
Opensource crossplatform Fallout 2 game engine writen in C++ and SDL
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Multiplayer Rogue-like combat game
Compatible client of Ace of Spades 0.75
Warlock of Firetop Mountain Roguelike
Harp Character Suite
An ASCII Rougelike - RPG