There is a Dota 2 Skin Changer for Windows project on Peerlist. A tool for applying any cosmetics in Dota 2 without purchase on the Steam Market. Supports all arcana (all styles are unlocked), all immortals (including gold), cash sets, regular sets, couriers, wards, terrains, weather, ads, music packages. It works via an external EXE, the F1 menu. You can view items for each character, combine individual items, save presets, and search by name. The size is ~6 MB. The author claims that the risk of VAC is practically zero — skinchangers are not explicitly prohibited, bans are only for maphacks and scripts. Works in rating matches. For Dota 2 fans who want to use all cosmetic items for free, this is a great and safe option.