Championship Manager 5 (CM5) is the 2005 PC entry in the long-running Championship Manager franchise developed by Beautiful Game Studios and published by Eidos. The term “CM5 editor portable” typically refers to unofficial, standalone (portable) tools created by the community to view and modify CM5’s game database, player attributes, clubs, competitions and save files without needing a full install or dependent runtimes. Because CM5 is an older, community-supported title, most editors are fan-made, vary widely in capability, and are distributed through retro-gaming and abandonware sites or forum threads.