Bebofe CPCteleraNext v1.01 by Arnaud Bouche based on SDCC v4.5.0 tjere was CPCtelera by Francisco Gallego based on an older version of SDCC. It's a game engine for Amstrad CPC written in C and Z80 assembler which was used countless of game notably for the CPCRetroDev competition (which has stopped sadly).

For more informations on CPCteleraNext, don't hesitate to go on CPCWiki.