Notebook.ai - A smart notebook that grows and collaborates with you
Kanka.io - Kanka.
Bookblock - Design-led custom notebooks & stationery.
World Anvil - World Anvil is a worldbuilding tool for Authors, Storytellers and worldbuilding lovers.
Stickies Capture by Miro - Digitize and edit handwritten sticky notes
Refsheet.net - Refsheet.