An online archive of 28 millions Buddhist texts--the largest collection of Buddhist and Tibetan texts in the world. Make sure to choose "English" when you explore the library.
This site is a part of the Jain Federation of North America. The "education" tab has a lot of good information about the Jain religion. Good for a younger audience.
This is the official site of the Bah'ai religion--a good place for general information and a contemporary look at the religion. Also includes a reference library (in English!)