The excerpt below is from The 7 best online whiteboards in 2021 — from zapier.com by Maria Myre

  • Miro for turning ideas into tasks
  • Stormboard for creating multiple whiteboards in a single brainstorming session
  • MURAL for remote, multi-member team meetings
  • Limnu for teaching students remotely
  • InVision Freehand for annotating design files with a team
  • Conceptboard for turning a brainstorming session into a formal presentation
  • Explain Everything for creating whiteboard videos

From DSC:
Other potentially-relevant tools/vendors here include:

Woman using the Cisco Webex Desk Pro