Old Tibetan

Gallica
International Dunhuang Project
Old Tibetan Documents Online

Classical Tibetan

Asian Classics Explorer
Buddhist Digital Resource Center
Resources for Kanjur & Tanjur Studies
The Buddhist Canons Research Database

Tibetan Studies

The Tibetan Tumulus Tradition
Tibetan Inscriptions in the Western Himalaya

Others

Sino-Tibetan Etymological Dictionary and Thesaurus