Rogue is described as '1980 computer role-playing game created by Michael Toy, Glenn Wichman, and Ken Arnold'. There are more than 10 games similar to Rogue for a variety of platforms, including Windows, Linux, Mac, Android and iPhone. The best alternative is Dungeon Crawl Stone Soup, which is both free and Open Source. Other Rogue like games are NetHack (Free, Open Source), Brogue (Free, Open Source), Classic Rogue (Free) and POWDER (Free, Open Source).
Dungeon Crawl Stone Soup is an open-source, single-player, role-playing roguelike game of exploration and treasure-hunting in dungeons filled with dangerous and unfriendly monsters in a quest to rescue the mystifyingly fabulous Orb of Zot.