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http://www.sagemath.org/

These are the public entries for this link:

• Sage: Open Source Mathematics Software
  Sage is a free open-source mathematics software system licensed under the GPL. It combines the power of many existing open-source packages into a common Python-based interface. Mission: Creating a viable free open source alternative to Magma, Maple, Mathematica and Matlab.
  By HarryManback in Software > tools with math opensource python
• sage Open Source Mathematics Software
  By AllanBaasch in Math with archetypes math mathematics open sage software source
• SAGE: Open Source Mathematics Software
  By ryanraaum in Public bookmarks with bioinformatics mathematics python scipy

NB: The average rating is calculated using the rating for both public and private entries for this link.