Excalidraw
Virtual whiteboard for hand-drawn diagrams
Free124.9K
Contrast Checker
helps check the contrast between the background of an element and the page itself. 
Design
About
helps check the contrast between the background of an element and the page itself. 
Alternatives to Contrast Checker
MarkText
Next generation markdown editor, running on platforms of MacOS Windows and Linux. [![Open-Source Software][OSS Icon]](https://github.com/marktext/marktext) ![Freeware][Freeware Icon]
Open Source57.1K
Penpot
Open-source design and prototyping platform
Open Source49.4K
tldraw
Infinite canvas drawing tool
Free47.6K