xtc is a macro system for C and the corresponding, extensible compiler, which is called xtc for eXTensible C. The parser generator and implementations are all in Java.

Cibyl is a programming environment and binary translator that allows compiled C programs to execute on J2ME-capable phones. Cibyl uses GCC to compile the C programs to MIPS binaries, and these are then recompiled into Java bytecode. Cibyl programs are regular compiled Java programs.