Elevate - Elevate is an award-winning brain training tool designed to build communication and analytical skills.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Peak - Peak is the automated way to keep track of what everyone is working on.
Standard Notes - A safe place for your notes, thoughts, and life's work
Brain Workshop - Brain Workshop is a open-source version of the dual n-back brain training exercise.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.