SafeNote - Encrypt and send files and notes with a link that automatically destruct after being read. SafeNote is a free web-based service that allows you to share a note or a file with confidentiality. There is no way to spying on you even to a hacker.
Google Calendar - Spend less time managing your day & more time enjoying it
Revealit.me - ReveaiIt.me allows you to send a one time link to a self-destructing document.
CalenGoo - Features | 1.0.175 for Android™
Frim - Frim is a client instant style Telegram LINE or messaging, allowing you to send and receive messages from your friends from the computer.
Jorte - Schedule books must be practical and has a good design.