Splashify - Beautiful desktop wallpapers for Mac and Windows
Future Me - Send an email to your future self
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
Dabble Me - Your own private place to write. A journal/diary to help you remember what's happened in your life.
Wallcat - Enjoy a new, beautiful wallpaper, every day.
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.