A traditional roguelike is a game in the spirit of classic Rogue and NetHack: turn-based grid-based movement, randomly generated dungeons, permadeath, and a huge number of interactions between objects and creatures. The graphics are often modest, but the depth of the rules is astounding. This is the most brutal and purest form of the genre.
You can download traditional roguelikes via torrent: the filters above will help you choose by language, size, and build type.