OpenApoc - Open Source X-COM: Apocalypse
OpenApoc is an open source clone of X-COM: Apocalypse that requires the original files to run, licensed under the GPL3 license and written in C++/SDL2. PmProg was founded in July 2014 and has since grown into a community. OpenApoc is in alpha build (meaning it's playable, but not all features are implemented) (06.2023) The project always needs active programmers!
FAQ
What is the server invite for the OpenApoc - Open Source X-COM: Apocalypse Discord server?
The invite link for the OpenApoc - Open Source X-COM: Apocalypse Discord server is discord.gg/f8Rayre
When was the OpenApoc - Open Source X-COM: Apocalypse Discord server created?
The OpenApoc - Open Source X-COM: Apocalypse Discord server was created on Jan. 30, 2016, 1:12 a.m. (8 years, 10 months ago)
Is the OpenApoc - Open Source X-COM: Apocalypse Discord server SFW?
Yes, OpenApoc - Open Source X-COM: Apocalypse is marked as SFW, meaning it should only contain topics that are safe for a work environment.