- Brackets.io. This open-source editor is still being cooked by Adobe, but it’s already awesome. It’s fast and featured, with some good extensions like Vim bindings.
- Draw.io. Yes, Visio is terrible and getting worse, as are many “enterprise architect” drawing tools. Meanwhile, the web-based draw.io is free, lightweight, easy to use, and often exactly what you need.
Perhaps if it ends with “io,” it must be good.