Stealthy: Secret Messenger - Chat anonymously with friends & strangers
Future Me - Send an email to your future self
Berkanan - Chat with people nearby. Even offline, on an ✈️.
Letter to Yourself - Send a physical letter to your future self
Roomvine - Chatrooms for real life venues, neighborhoods and events
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.