Notebook.ai - A smart notebook that grows and collaborates with you
Google Open Source - All of Googles open source projects under a single umbrella
Bookblock - Design-led custom notebooks & stationery.
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Action Method Notebooks - Notebooks for making ideas happen
Open Source @IFTTT - A collection of IFTTT OSS projects.