tmux is a terminal multiplexer
Simple C compiler
Free 32/64/16-bit multi-platform Pascal and Object Pascal compiler
A free COBOL compiler
OS X crash report symbolicator
A BASIC interpreter and compiler with graphics.
ACPI Machine Language IDE for OS X
A GHC-based Haskell to JavaScript compiler
An experimental BASIC language for Linux, Mac OS X, and Windows.
Converts (packages) Python programs into stand-alone executables