IT:AD:Diagrams.Net
Summary
Nothing like having a great – free – diagraming tool at your disposal when ever you need it.
Notes
- According to their about page (https://www.draw.io/about.html), will always remain free.
- Integratable via Chrome. Original announcement (I would go to Chrome store to install the latest version): https://plus.google.com/u/0/100634082864796769666/posts/TRKCK9t4At9