draw.io - Online diagramming application
Specify App - Specify is the Design Data Platform for your design & dev teams:🎨 Collect your design tokens and assets from Figma🤖 Store them in a single source of truth⚡️ Distribute your brand with custom delivery pipelinesGet started for free → specifyapp.com
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
Figma Design Tokens - Making design tokens a single source of truth for Figma.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
Marvel Platform API - Let's build the future of design together