Sage ( http://sagemath.org/ ) is getting more mature by the minute. I
recently started playing with the latest, leading me to poke around
for more information.
William Stein, the creator/leader of Sage, has written a number theory
book using Sage, and has a class he teaches using Sage .. including
videos and other materials like sage workbooks:
http://wiki.wstein.org/2008/480a/schedule
The rest of the site has similarly interesting materials.
-- Owen
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