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Here a few links to software I wrote:

CHICKEN


A mature compiler for the Scheme programming language, targeting C, initially started by me but now actively developed and maintained by 
a bunch of enthusiasts.

BONES


Another Scheme compiler, targeting x86_64 systems. Not actively developed anymore.

MA


A minimalistic variant of the Acme editor, written in Tcl/Tk. 
I use this for my daily work.

Strand


An implementation of the "Strand" parallel Prolog dialect, as described
in the book "Strand: New Concepts for Parallel Programming" by 
Ian Foster and Stephen Taylor. Not actively developed and superseded by the 
following project:

FLENG


A compiler for FLENG, Flat Guarded Horn Clauses and Strand for x86-64, 
Aarch64, ARM M1, armv7 and RISC-V systems.

microFLENG


A minimal variant of FLENG for CP/M, C64 and the "uxn" virtual machine.

UF


A Forth system for the "uxn" virtual machine.