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Diamond Way Tibetan-English-Dictionary of Buddhist
http://www.diamondway-buddhism.org/diction/diction.htm
Nitartha Online Tibetan-English Dictionary
http://www.nitartha.org/dictionary_searchback.html
The Dharma Dictionary is an ongoing project to compile English translations of Tibetan Buddhist terms. [approximately 85,000 entries, not only Buddhist terms!]
The Online Tibetan to English Scanner/Dictionary
http://www.people.virginia.edu/~am2zb/tibetan/index.html
A useful tool for helping Tibetan to English translators by automating the translation process. Breaks up a Tibetan phrase into its different parts, displaying definitions.