A free C, C++ and Fortran IDE
Cobol Cross reference tool for GnuCobol written in Cobol
ATasm is a 6502 command-line cross-assembler.
BCPL was designed by Martin Richards at Cambridge University (1966)
A C Compiler/Editor for Retro 6809 Machines (Colour Computer/Dragon)
Embed C++ in Python source code, dynamically compile and access data
z390 Portable Mainframe Assembler and Emulator
dependently typed functional programming language
Assembler language for modern times