Flow chart, sequence and class diagrams are the ones I use the most in my current job.
In source, I generally use Mermaid[1] as its syntax is easily maintainable and understandable. And our documentation (mdBook) is written in markdown and can render Mermaid via a plugin[2].
When drawing quick diagrams during online communications, I use Excalidraw[3] as it's easy to use and has a nice whiteboard style to it. When I'm with my team (pre-covid), whiteboard or paper did the trick.
In source, I generally use Mermaid[1] as its syntax is easily maintainable and understandable. And our documentation (mdBook) is written in markdown and can render Mermaid via a plugin[2].
When drawing quick diagrams during online communications, I use Excalidraw[3] as it's easy to use and has a nice whiteboard style to it. When I'm with my team (pre-covid), whiteboard or paper did the trick.
[1]: https://mermaid-js.github.io/ [2]: https://github.com/badboy/mdbook-mermaid [3]: https://excalidraw.com/