This is a list of people and works that helped in various degrees with the development of this hack:
Felineki: CRE would not be possible without his amazing research and very detailed info about the inner quirks of the CPS1 SF2 games.
Sebastian Mihai: while working on his own SF2CE hacks, he developed a SDK of sorts, and made if freely available for those who would like to delve into SF2/CPS1 hacking. Thank you!
Super Street Fighter II Turbo - New Legacy by Born2SPD: a state of art hack for the fan favorite Super Street Fighter II Turbo done by a passionate ST player, it fixes almost all the bugs from the original game, while adding a lot more content. His site describes in details all the changes done, and it's a source of knowledge for any SF2 player. Undoubtedly a huge inspiration for CRE.
Super Street Fighter II Turbo - HD Remix: just like NL, lots of cool ideas were included/adapted for CRE. Check out the author's site.
Street Fighter II' Champion Edition - Sheng Long by Drakon: altough a very different approach from CRE (it's a slightly fairer Rainbow Edition version), this ROM hack includes tons of great info in its ROM ZIP file, which helped a lot during the initial stage of CRE. Youtube channel.
Sexodrilo: he developed a really cool and complete LUA training script, which lots of onscreen info like hitboxes, charging times, dizzy meters, etc. an invaluable tool for the CRE development. Gracias, hermano!
Dammit: developed a great hitbox viewer LUA script, not to mention his extent research on the inner functions of the Street Fighter II games.
The Cutting Room Floor: helpful info about secrets buried deep down lots of game ROMs. Site: TCRF.net