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i-blison SymPy - Python library for symbolic mathematics

Mathics (http://www.mathics.org/) is a pretty useful online algebra system (with MathJax display) for symbolic computing à la Mathematica, backed by SymPy for most tasks and Sage for advanced stuff. You can check gallery and docs at http://www.mathics.net/

i-blison Structured Procrastination

This is a pretty well known text, almost a classical on procrastination. Posted on HN at least once in 6 months.

i-blison The Touch Book

Linux Journal (2010-02) did an overall positive review of the device, well, a least for the technical-savy geeks who like to tinker with their machine. The software part, still in beta, seems a little bugy.