Penpot is a free open source interface design platform based around open standards. It's web-based and can be used collaboratively on any OS. You can follow their video account at:
➡️ @penpot_app
There are already over 80 videos uploaded. If these haven't federated to your server yet, you can browse them all at https://peertube.kaleidos.net/a/penpot_app/videos
You can also follow their non-video account at @penpot
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