List of projects accepted into SymPy
SymPy is a Python library for symbolic mathematics. It aims to become a full-featured computer algebra system (CAS) while keeping the code as simple as possible in order to be comprehensible and easily extensible. SymPy is written entirely in Python and does not require any external libraries, which makes it available everywhere Python can be used.
It has a liberal BSD license allowing other open source projects and commercial companies to make use of SymPy in their own projects. SymPy has a vast array of potential applications, from theoretical physics (atomic physics, quantum field theory, general relativity, classical mechanics, quantum information...), applied math (solving algebraic and differential equations, ...), teaching (calculus, integrals, derivatives, limits, ...), web (it runs on the Google App Engine), and it can also be included as a library in any scientific code.
SymPy has a large, active development team that has increased non-stop since 2007 (ref: http://www.ohloh.net/p/sympy) thanks to an extensible architecture that enables features to be added easily and in a modular way. It is built and tested regularly on all major platforms and all major architectures to ensure that it can reach the widest possible audience.
The official code samples for SymPy at available at http://code.google.com/p/google-summer-of-code-2011-sympy/. We have a detailed report of the project for this year at https://github.com/sympy/sympy/wiki/gsoc-2011-report.