Other fantasy classics also live on. M. A. R. Barker's glorious setting of Tekumel, captured early in TSR's 1976 Empire of the Petal Throne, has reappeared in a melange of small-press successors down to the present. It's arguable whether the unofficial Tekumel rules sets technically qualify as retro-clones, but look for yourself and decide whether to start drinking that ocean.
Steve Jackson's first RPG was The Fantasy Trip, published in installments by Metagaming in the late '70s. With its point-based character creation and hex-based movement, TFT crucially influenced Champions and many other 1980s tactical RPGs. (The fan site TFT Codex has a good TFT resource page.) The Fantasy Trip's true spiritual successor is Jackson's own GURPS, but a few fans are cloning the original. Gavin Gossett's The Fantasy Quest is slow lifting off, and Chris Goodwin's Warrior and Wizard is currently just a shared Google Document. But Dark City Games is producing a handsome line of TFT-compatible microquests for its super-condensed seven-page PDF clone, Legends of the Ancient World.
Other retro-clones emulate 1980s RPGs that post-date the old-school classical ideal. In fact, some of these versions embody design approaches alien to the old-school aesthetic of OD&D ad-hoc improv. But retro-clones aren't just about old-school. Like those already mentioned, each of these versions springs from a genuine wish to share:
•ZeFRS (Zeb's Fantasy Roleplaying System) emulates TSR's original 1986 Conan RPG by David "Zeb" Cook. This version adopts Conan's one-table resolution system but omits one of the original's most interesting features, its chase flowchart.
•Phil Reed's Four Colors System clones TSR's original 1985 Marvel Super Heroes game. The project had a bumpy birth, funded by a ransom publishing model and then long delayed, but the free 34-page PDF is now available at the Seraphim Guard site.
•Venerable gamer Berin "Uncle Bear" Kinsman, who carved his first polyhedrals from Earth's cooling crust, has gifted the field with Double Zero, based on the respected 1983 Victory Games superspy RPG James Bond 007. (Scroll down near the bottom of the page. Note Bear's "Stress and Trauma: Mental Health Rules for GORE.")
•There is even - follow me closely - a tabletop paper-and-dice clone of the original Final Fantasy I videogame. Levi Kornelsen's 2005 8-Bit Dungeon: An Adventure Game of Funny-Shaped Dice, a free PDF, is an adventure game that can be played solo, without a gamemaster. Nostalgia soaks each of its eight packed pages.
Retro-clones are undeniably part of the future of RPGs. As selections of physical rulebooks dwindle in book and game stores - and as the stores themselves dwindle with them, not to mention the publishers - these online communities, organized around PDF and print-on-demand, will become increasingly important to our hobby. OGL-licensed and other open systems allow loyal fans, free from legal entanglement, to produce new material for their favorite games - and to share it freely. In roleplaying, as long as there is sharing, there is life.