Marathi Keyboard is a great app for Marathi Typing
This keyboard comes with Predictive Text in Marathi
You can write directly in Marathi in any of the applications like
1. Facebook Status
2. Emails writing
3. Whatsapp chat
or any other app where you want to type in Marathi but still want to use same English keyboard.
Use this keyboard, this is transliteration tool for Marathi.