BASIC interpreter for the 16bit PIC microcontroller 24FJ64GA002. The interpreter runs on the chip only, no compiler/tokenizer is needed. Communication with PC is done by USB-to-serial converter cable.
Specter - Abstract Arithmetics Library (AAL) is a library coded in native C which is able to do operations with numbers of virtually unlimited length. Specter is targeting mainly cryptography and big integer maths though.