Witeboard - A real-time whiteboard for your team. No signups required.

Synology Note Station - Without needing to spend money on Evernote, Synology Note Station provides a desktop client to organize all your random notes in one place.

Whiteboard Fox - Simple Online Whiteboard

UpNote - A beautiful and clean cross-platform app for notes organizer

Stormboard - Stormboard empowers data-driven companies to turn their unstructured whiteboards into data-rich collaborative workspaces; enabling data-driven decisions and efficient processes — often eliminating the need for meetings entirely.

Notesnook - Notesnook is a simple and private note taking app that keeps your notes organized and synced on your phone, tablet and computer.