ApproveIt for Slack - Get approvals in minutes, not days. Right from Slack!
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.
RemoteTeam - Remoteteam.com helps remote teams become great places to work with the fully-integrated platform to automates payments and HR tasks.
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.
Swipes - Plan projects, take action and discuss.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.