Jarvis

This is a cool bot for Messenger to remind you to get stuff done.

It is extremely pleasant to use, doesn't require any special commands, just guides you through in the conversational mode.

Basically, you tell him when and what to remind you, and it sends you a relevant message at the proper time. This is a super easy method not to forget about getting small things done like call your granny, buy milk on the way home, etc. Great!