Sanskrit IAST data entry tool

[JAGANADH GOPINADHAN]

Dear friends
Which is the best tool to data entry Sanskrit text in IAST from(Unicode). 
e.g Text with diacritics. (Aṣṭāṅgahṛdaya)
Please provide the name of font and tool can be used to enter Devanagari text in the above given format.



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