Electronic version based on:
Apte Vaman Shivaram
Revised and enlarged edition of Prin. V. S. Apte's The practical Sanskrit-English dictionary. Poona: Prasad Prakashan, 1957-1959. 3v.
Arthur Anthony Macdonell
A practical Sanskrit dictionary with transliteration, accentuation, and etymological analysis throughout. London: Oxford University Press, 1929.
Maṇḍala Pati dāsa
List of verbal roots with final forms
I will recommend.
This is a best (and professional) Sanskrit dictionary I've ever saw. It's very helpful that program allows to search in THREE dictionaries simultaneously. Thanks a lot to the author for this useful program!