- Buffon's Needle@
dir.yahoo.com/.../Calculating_Pi/Buffon_s_Needle
- Abacus, The
Calculating with beads. Information on how to use either a real life abacus or the online Java model.
www.ee.ryerson.ca:8080/~elf/abacus
- White Space Calculator
Programmable calculator, with support for recursive functions and local variables.
www.bluering.nl/whitespace
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