CHICKEN a compiler for the Scheme programming language.
BONES, another Scheme compiler, targeting x86_64 systems.
ff, a Forth system for i386 and ARM.
GRASS, a Scheme interpreter written in (mostly) R5RS Scheme.
FurryPaws, a compiler for FP, written in FP (old)
ma, a minimalistic variant of the acme editor, written in Tcl/Tk.

Contact me a felix <at> call-with-current-continuation <dot> org.

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