An open source reimplementation of the original XCom
UFO: Enemy Unknown (X-Com: UFO Defense in USA) is a popular strategy videogame made by Mythos / Microprose, where you take control of the X-Com organization to fight off the alien menace invading Earth.
OpenXcom is an open-source reimplementation of that game, licensed under the GPL and written in C++ / SDL, which was started back in February 2009 by a bored old university student who loves X-Com way too much.
The problem is by now the original game is very old, buggy and dated. So the goal of this project is to bring back the tried and true feel of the original with none of the issues! All the same graphics, sound and gameplay with a brand new codebase written from scratch without disassembling the original executable.