Open-source alternatives to Figma

Penpot is open source: free to download and run on your own server. Figma costs from $12 a month, with a free plan.

Penpot

Open source (MPL-2.0) · Open-source design and prototyping that you can host yourself

Penpot is an open-source platform for interface design, prototyping and design systems built on web standards. It is aimed at design and development teams, including those who self-host.

Layouts with CSS Grid and Flex
Interactive prototyping
Design tokens
Shared component libraries
Self-hosting

Free plan. Unlimited is $7 per editor a month, capped at $175 a month. Enterprise is $25 per member a month.

See Penpot Penpot vs Figma Source code

Before you switch

Free to use, not free to run. The licence costs nothing, but self-hosting needs a server (often $5 to $40 a month) and someone to install updates and keep backups.
Open core means the main product is open source but some features, usually for larger teams, need a paid licence.
Hosted versions exist for many of these, run by the makers. They cost money but save the upkeep, and you can still move to your own server later.
Licences differ. MIT and Apache allow almost anything. GPL and AGPL require you to share changes you make to the code; for normal business use, that rarely matters.