From English Wikipedia:
Retrospec is an internet based collective of coders, graphics artists and computer musicians. They specialise in taking popular games from the eighties and rewriting them using the extra power that is available in more modern computers, whilst attempting to stay true to the feel and gameplay of the original game. Such a game is generally known as an enhanced remake.
Retrospec was formed on the 10th February 1999 after a discussion in the comp.sys.sinclair newsgroup. A post the day before by Jeff Braine, one of the founders, called for like-minded programmers, graphic artists and musicians to express their interest in a formalised group working towards remaking classic computer games. The name Retrospec was suggested by Richard Jordan, another of the founding members.