FreeOrion is a free and open source community-developed 4X turn-based galactic empire strategy game.
not really usability.
broken. I LOLd. Critical defect which prevents load/save/options to work on Windows 6.0+ persists for 3(!!) years and no one cares to patch that? Also, new issue reports are being deleted as duplicate of older issue which is still open/unassigned/no resolution. No wonder what this project sucks.