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

Journaley - A simple and elegant open-source journal keeping software for Windows compatible with Day One

Future Me - Send an email to your future self

Daybook - Daybook is an application that allows you to record activities, experiences, thoughts, and entire ideas throughout a day and protect all of your information with a strong password.

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.

Jot+ Notes - Jot+ Notes is a software that acts as a text compressor, offering you to compose, arrange and manage notes, recipes collection, work records, contacts, to-do lists, addresses, and personal information.