Zenkit - Zenkit is the home you always wanted for your ideas, your projects, your business.
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.
CryptoTE - CryptoTE is a text editor with integrated strong cryptography.
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.
StoryWall - Cards on a wall. But, like, totally digital.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.