Here are a few Tibetan Texts that might be helpful:
- All Tibetan Texts from the Asian Classics Input Project, Converted to Wylie-Transliteration
- List of Sera Textbook Definitions (Tibetan)
- Abhidharmakosha – Root Text and Root Text with Dictionary Annotations
- Bodhicharyavatara – Root Text and Root Text with Dictionary Annotations
- Madhyamakavatara – Root Text and Root Text with Dictionary Annotations
- Middling Lamrim (Tsongkhapa) – Root Text
Online research tools and other sources for Tibetan texts and teachings:
- Tibetan Buddhist Resource Center – Extensive archive of scanned Tibetan texts together with a large database of Tibetan authors and their works
- UMA Institute for Tibetan Studies – Website by Jeffrey Hopkins and others containing various Tibetan textbooks, English translations of them, and more
- The Buddhist Canons Research Database – Resources for scholars of Tibetan language (Extensive bibliographic database and full-text search for the entire Lhasa Kangyur and Derge Tengyur.)
- Tibetan and Himalayan Library – Many resources about Tibetan Buddhism and Tibetan language by the University of Virginia, incluing sizable parts of the Derge edition of the Tibetan canon.
- Jeffrey Hopkins Tibetan Treasure Archive – Archive with many early recorded teachings of His Holiness the Dalai Lama and other Tibetan teachers. Many of the teachings are with English translation but some are only in Tibetan.
- The Padmakara Translation Comitee offers a selection of various electronic texts in Tibetan language – some of them for free and some of them for sale. The focus is mostly on Tibetan translations of important Indian treatises as well as material from the Kagyu and Nyingma traditions.