The University of Konstanz in southwestern Germany has put together a really wonderful tool, the Database of Constitutions of Sub-Saharan Africa. Using it, you can glance through constitutions, amendments, and various constitutional documents for most of sub-Saharan Africa, using web sources and pdfs. It’s a work in progress, but it already has a sizable number of founding documents included. If you’re interested in constitutional law or politics in Africa, it’s a great resource to bookmark.