Here's a really useful piece of software I found: https://sketchboard.me (This is not an "alternative" question. I thought it might be helpful to use this webapp as an example of the feature set I'm after, which I've defined independently and specifically below.)
Unfortunately, it's only available as a webapp.
I'm looking for something similar that can be downloaded as a program and used offline.
Should save files to disk (i.e. locally and not online.)
- Infinite (at least near enough) panning canvas
- Draw freeform lines
- Type text boxes
- Put in images
What would be great:
- Balsamiq-esque wireframes of common tools that can be dragged into positions.
- Arrow tools.
- Zoomable canvas