New Version! The chart done as an isometric dungeon! Available for free as a large image or as a poster print. (On the linked page, scroll down to the 600-pixel thumbnail version and click it for the 300+ pixel version.)
This chart distinguishes between 100 (or so) traditional role-playing games. Some decisions are distinguished based on game mechanics, some by setting and some are funny quips based on popular opinion. Start in the green diamond.
If you have suggestions of games to add, please suggest them in the comments! But please also include one or two things that differentiate the game you’re suggesting. Also feel free to mention more/better ways to differentiate the games already on the chart. Keep in mind not every game can be included: popularity (this isn’t designed to be centered on the small press), varying game mechanics, and setting/genre are the primary factors.
Also, while you’re here take a look at the square graphic links to the far right for a slew of other useful free RPG tools (a coat of arms design tool, random map generators for cities, villages, dungeons), inn menu/patron/floorplan generators, magic item shop generators, full featured RPG Map Software for hex/wilderness maps as well as dungeon/building maps, etc.) hosted here. —->
By the way, hot-linking directly to the image is turned off so you need to link to the page. This ensures people always see the latest version. (The web site software versions the files, so linking directly would otherwise go to the old version.)