Useful links

A provisory list of geometric integration groups around the world:

NA at DAMTP, University of Cambridge, U.K.
SYNODE, the Trondheim-Bergen project "Symmetries in Numerical Solution of ODEs".
GIB -- Geometric integration in Bergen, University of Bergen, Norway.
GNIB -- Geometric numerical integration group in Bari, University of Bari, Italy.
GI at the university of Leicester

Projects in Geometric Integration

CoRGI, Collaborative Research in Geometric Integration

Repositories of useful SOFTWARE:

DiffMan, and object oriented MATLAB toolbox for solving differential equations on manifolds