Google Keep is a cloud based note taking application.

GNotes is a simple and clear note app. It is available for you to take notes, keep a diary, write down ideas, create checklists, etc.

Fetchnotes is a simple way to keep track of notes and to do's so you can stay in sync with the people that matter to you.

Grafio is a fun and capable diagraming app for iOS with plenty of features at a fraction of the cost of others.

MacJournal is journaling and blogging software.