Letter to Yourself - Send a physical letter to your future self

ManyChat - ManyChat lets you create a Facebook Messenger bot for marketing, sales and support.

Future Me - Send an email to your future self

Landbot - An intuitive no-code conversational apps builder that combines the benefits of conversational interface with rich UI elements.

Letter to my future self - Letter to my future self is a prominent email scheduling service that gives you the opportunity to create a letter with goals and thoughts for your future self and schedule a date for sending it.

iDoneThis - iDoneThis The fun, easy way to get stuff done. Every day we’ll email your team to ask, “What’d you get done today?” Just reply to our email. The next day, everyone gets an email with the team's accomplishments