A free program for Android, by Keyboardpad.
Tamil Keyboard is an easy-to-use and fast Tamil typing app for android mobiles. With the help of the Tamil Keyboard, you can type in Tamil and English at the same time. It contains all the basic Tamil letters, and you can use it without having to install any other fonts or tools. It also has the ability to easily change the theme, background, and other settings, which will make your phone look better and be easier to use. It is designed to work on any android phone, and it is completely free to use. You will not need to install any other tools or software to make it work.
You can send an email or give your feedback on the play store.