Knotable - Cut the noise out of busy email threads
Productify - Sell your WordPress content using Gumroad
Scrapbox - A new style of note-taking that lets you create, discuss, and learn together in one self-organizing space.
Typeboost - Music stops when you stop typing. Stay focused while writing
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
Alternote - OS X note-taking app for Evernote.