GoldenDict is a program which allows one to install custom dictionaries.

Download it here: GoldenDict for Windows and here GoldenDict for Mac

Download Sanskrit Dictionaries here: Sanskrit Dictionaries

How to install Dictionaries:

• Download all of the dictionaries in one folder and extract them.

• Install GoldenDict software, open it and go to Edit > Dictionaries

• In Source tab, select the Files tab, click on [Add] and select your Dictionary folder where you extracted your dictionary.

• Check recursive and click on [Rescan now] bottom.

• Wait to complete dictionaries installation.

• Click OK.

• Enjoy.