Evernote

Evernote is a useful tool that you can add reminder and to do list with Evernote on Android. It is especially helpful for those businessmen who have made lots of appointment with their business partner. You are allowed to add new text, page, photos or voice reminder on Evernote.
The first time I try this app, I found it amazing, because it is truly helpful for the ones who has a poor memory like me. It will be more convenient because you can check the to-do list frequently to avoid missing important appointments.