Excalidraw
Virtual whiteboard for hand-drawn diagrams
Free124.9K
Monosnap
create screenshots, annotate and upload them to the cloud. 
Design
About
create screenshots, annotate and upload them to the cloud. 
Alternatives to Monosnap
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