An anonymous reader writes: Sometimes games don't get the sequels that they deserve — unless their fans have a say. In a new article published today, the author takes a look at some of the best homebrew sequels and open source clones, from the blockbuster Half Life reimagining Black Mesa to OpenTTD, the fan-made version of Transport Tycoon. StepMania might just be the most remarkable of them all: originally built as means to open Dance Dance Revolution files, it's evolved into a rhythm game engine in its own right, powering iPhone games and arcade cabinets alike. The creator, meanwhile, has landed a job as a software engineer at Pinterest. Not bad for an open source clone.