Quant-UX is worth a look for prototyping needs, it's OSS as well and can generate end HTML/CSS code: <a href="https://quant-ux.com/" rel="nofollow">https://quant-ux.com/</a><p>Lunacy supports multi-player in the way Figma users are used to: <a href="https://icons8.com/lunacy" rel="nofollow">https://icons8.com/lunacy</a><p>Frame / Plasmic generates code, the latter focusing on React: <a href="https://www.framer.com" rel="nofollow">https://www.framer.com</a> / <a href="https://www.plasmic.app/" rel="nofollow">https://www.plasmic.app/</a><p>But yes it does appear that Penpot for now is the most obvious de facto Figma alternative.<p>The silver lining of this whole debacle has been that it's brought to surface a lot of other alternatives that folks would not have otherwise considered or looked into, which are actually quite decent I'm finding out.