nsync is a C library that exports various synchronization primitives
Software development for 4Mb portable, using Z80 CPU and AA batteries
C compiler and dev kit for the z80 with assembly language libraries.
A set of tools related to assembly language programming.
SIMD macro assembler unified for ARM, MIPS, PPC and x86
M6811 Code-Seeking Disassembler
A "Just Enough Language" compiler targeting the 6502/Z80/6809
A C Compiler/Editor for Retro 6809 Machines (Colour Computer/Dragon)
zCOBOL portable mainframe COBOL compiler, part of the z390 project