OpenXcom

Requires a vanilla copy of the X-COM resources, which can be a barrier for users without the games and limits portability, as emphasized in the installation warnings against modded versions.

Mod setup can be messy, requiring manual extraction and file rearrangement in directories, leading to potential errors and crashes, as noted in the README's mod installation guide.

Development relies on older libraries like SDL 1.2 and specific versions of yaml-cpp, which may be challenging to install and maintain on modern systems, per the development requirements.

Only supports the two original X-COM games, lacking native expansion to other titles or entirely new games without significant modding effort, restricting its use beyond preservation.