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Sage: Open Source Mathematics Software
Sage is a free open source mathematics software system spanning a huge range of mathematics including algebra, calculus, combinatorics, number theory and graph theory.
link: http://sagemath.org/
tags: sage sagemath sage math open source gpl floss software mathematic mathematics math maths cas computer algebra system python cryptography numerical computation algebra group theory combinatorics graph theory calculus symbolics number theory mathematical programming scientific computing interactive maths mathematica groups finite field opensource math mathematics software math notebook
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Keyczar
Keyczar: An open source cryptographic toolkit
link: http://www.keyczar.org/
tags: open source free google development encryption keyczar keys cryptography signatures digital signatures public key encryption aes rsa dsa hmac