The Tool Command Language implementation
Interpreter and compiler for the Seed7 programming language.
A minimalistic but complete standard Forth compiler in C
A Pikalang interpreter written in C
The interpreter for BrainF
DPDL (Dynamic Packet Definition Language) is a small framework library
Java Internet Prolog (Moved to GitHub)
SBI - A Small Bytecode Intepreter to run programs on an AVR from SD
Poe is a small, fast, flexible scripting language.
Parsing for everybody.