For me it is a convenient and compact tool in which I can put all my ideas, goals, thoughts
Confluence - Confluence is content collaboration software that changes how modern teams work
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.
Slack - A messaging app for teams who see through the Earth!
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
Yammer - Yammer is a leading enterprise social network used by more than 200,000 companies worldwide, including 85% of the Fortune 500, to get work done smarter and faster. Sign Up Today.
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.