Scheme

Scheme is a programming language derived from LISP that is widely used in education, particularily computer science education. There is a portable Scheme implementation DrScheme that supports Unicode.

DrScheme Scheme (Lisp) for the XO is available here.

The Linux binary that they distribute was compiled under Fedora Core 2 so it should require little work to adapt it to the OLPC's 2B1.

More information about DrScheme and Scheme in general:

• http://www.drscheme.org
• http://www.schemers.org/
• http://www.teach-scheme.org/
• http://www.htdp.org/