Dyalect is a programming language for .NET Core
eXist-db is a feature rich Open Source native XML database
A BASIC interpreter and compiler with graphics.
A free, cross-platform emulator for GW-BASIC, PCjr & Tandy BASIC
Emulator of the ancient 8 bit microprocessor SC/MP 2
emscripten'ed MRI
BASIC-like language interpreter for embedded systems
A free cross platform command prompt
IDLE Extensions
Programming language with expressive power and a simple implementation
DatabeneScript is a Java library for resolving Java-like expressions
CSS validation and advanced preprocessor with nesting and variables
Proof Logic : A logical framework for theorem proving
R7RS Scheme scripting engine
Student Programming Language (SPL) a subset of PL/I