Future Me - Send an email to your future self
echofin - Echofin helps communities grow, engage and monetize their following in ways no other platform has done so far.
Letter to Yourself - Send a physical letter to your future self
MirrorFly - World's Most Scalable Voice, Video & Chat SDK for Small, Medium & Enterprises
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.
chatwee - Group chat app for online communities. Used wherever visitor interaction and engagement are key to the site's functioning.