Just saw GTA III re[1], but there are other similar projects that impress me. Prince of Persia[2] is an interesting one as is Starcraft running on arm[3].
And what about you? What is the recompiled software that amazes you the most?
[1] https://github.com/GTAmodding/re3 but [2] https://github.com/NagyD/SDLPoP [3] https://pyra-handheld.com/boards/threads/starcraft.73844/