Figma/Canva alternatives for self hosting

Hello! I have had my homelab for a few years now, my work horse server is an "old" 2019 HP Omen gaming laptop I no longer needed and it has been fun to tinker and play with! I've installed Ubuntu server on it, along side Red Hat (for professional development) and have CasaOS running on the Ubuntu side for management of my containers.

My question is and I don't quite know how to search this or if it's proper for this subreddit but I am getting out of options and want to see if any of you have had this experience.

I am in need of the use of Canva or Figma (for its whiteboard feature) to use with a small team of people that I have put together, but I don't want to pay for the subscription. If I can self host, I'd rather go that route. Do any of you know if a good alternative?

It seems like a long shot, but Google has not yielded any good results :)

Also, thank you for reading this post, and I truly hope you have a great week!