The Tool Command Language implementation
The Saxon XSLT and XQuery processor, developed by Saxonica
REXX interpreter
Expert System Tool
The GNU Prolog native compiler
bash debugger
Agena is an interpreted procedural programming language.
A tiny Scheme interpreter for embedding in programs.
Interpreter and compiler for the Seed7 programming language.
Dynamically loaded extension libraries for GNU AWK
A BASIC interpreter and compiler with graphics.
Next Scripting Framework (NSF)
A modern descendant of the Icon programming language.
Tool support for the Z formal notation