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

drumbit - A very easy to use drum machine.

Whiteboard Fox - Simple Online Whiteboard

Type Drummer - Drum by typing

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.

Sampulator - Make (and record) beats on your keyboard