Namaska Sahasranmaji,

Wonderful Thread! Thank you!

May I propose a couple of Android Apps that have been of great help to me? I have a long commute and these are of great help in making use of all that time on crowded buses and trains, and can be used on any Android device. They are in Google Play, but they are not free.

WAGmob's Learn Sanskrit (Speak and Write) - Great for beginners to use in order to learn the alphabet and numbers, along with some vocabulary.

Krishna Varma's Sanskrit Primer - Great intro that also has good resources for those who are a bit more advanced and could use a pocket reference.

Pranams