Small Device C Compiler v2.9.0 is out (since 22th march 2009), it's a freeware, retargettable, optimizing ANSI - C compiler that targets the Intel 8051, Maxim 80DS390 and the Zilog Z80 based processors. Contiki (a small but modern operating system) for Amstrad CPC was compiled with SDCC. BTW, last version of contiki (v2.3.0) is out since the 27th june 2009.