World Religions: Websites

Buddhism

• Buddhanet
• Pali Canon Online: The Original Words of the Buddha

Christianity

• Bible Gateway
• Gnostic Society Library: Dead Sea Scrolls Texts

Islam

• Al-Islam.org Ahlul Bayt Digital Islamic Library Project 
• Islam and Islamic Studies Resources

Judaism

• Center for Jewish History

Shinto

• Encyclopedia of Shinto

Statistics and Data

• Association of Religion Data Archives
• Pew Research Center Religion and Public Life Project

Various

Internet History Sourcebook

• East Asian Religious Traditions
• Indian Formation of Religious Traditions
• Jewish History
• Islam Faith and Theology

Internet Sacred Text Archive

From Primitives to Zen (focus on ancient and non-Western religious traditions)