Solveig

Solveig — a small object-oriented language and its toolkit: bytecode compiler (Solas), virtual machine (SolVM), REPL (Solis) and debugger (Solid). Prototype-based, everything is a message send, 145 messages, no control-flow syntax and no operators outside @expr. 20k lines of C11, no dependencies.

Description excerpted from the original listing, which is linked below.