Diagrams & Prototyping

Flowcharts, wireframes, whiteboards, and UML push people toward Lucidchart, Figma, and Miro. Free editors exist for the same kind of drawing — in the browser or on the desktop — with varying collaboration.

Component libraries and “comments on the whole company file” can be smoother in paid SaaS. For documenting systems, classes, and prototypes, the alternatives on this page avoid another subscription. Links only to official projects.