Computer Algebra Research Group (CARGO)(site info)
Department of Physics and Computer Science of Wilfrid Laurier University, Waterloo, Ontario, Canada. Research interests include Gröbner Bases, Implicitization on Polynomial Curves and Surfaces, Enumerating Regular Mixed-Cell Configurations, Symmetric Polynomials.
http://www.cargo.wlu.ca/
LiDIA Group(site info)
Based at the Darmstadt University of Technology, Germany. LiDIA is a C++ library for computational number theory which provides a collection of highly optimized implementations of various multiprecision data types and time-intensive algorithms.
http://www.informatik.tu-darmstadt.de/TI/LiDIA/