The folks at the Comparative Constitutions Project created an excellent new resource, Constitute, an on-line, searchable, and topic-tagged collection of the constitutions of the world. (H/t to Michael Huggins.) The site is quite user-friendly and offers a terrific and easy way to bring comparative constitutionalism into your classroom or to search for comparative provisions in world constitutions for your writing.
Constitute currently includes every constitution in force as of September this year, with plans to include a version of every available constitution written since 1789.