This page links to the African entries in the OSGeo gallery page. Add your entries to the main gallery page, and link them here so that we can show everyone our contributions.
You can also find case studies on the sites of different software packages, for example:
Please also have a look at the OSGeo wiki page that links to Case Studies of FOSS4GEO projects around the world. These range from comparisons of desktop clients to full-blown spatial data infrastructure implementations, and discussions of Open Data and Open Source policies.