I have listed few bot engines which makes it easy for you to build a bot.
I have built a few bots in messenger. Let me share them if that might help.
This is an English-Hindi dictionary bot. Enter any English word and it gives you the corresponding Hindi meaning.
This bot gives you the daily news updates, you can also subscribe to daily news alerts. This is available in 4 Indian languages(Hindi, Urdu, Punjabi, Telugu).
This is a quiz bot that shoots general knowledge questions and is available in 3 Indian Languages(English, Telugu, Hindi ).
This is a translation bot that helps you translate any words or sentences in regional languages. Currently, this bot supports Hindi-Punjabi, Hindi-Urdu, English-Hindi language pairs.
We look forward to building many more bots as such for regional language support to help people eliminate the language barrier.