Infinite canvas for taking notes and recording ideas in a freeform way

Question

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.)

Feature requirements:

• 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.
• Colors.
• Arrow tools.
• Zoomable canvas

Answer 1

How about draw.io?

• Can be downloaded and used offline as an installed- or as a portable program, or can be used online without an account and with saving files locally.
• Canvas automatically expands
• You can draw freehand lines
• You can import images
• Has a huge catalogue of shapes and support of custom shapes
• Colors (Fill, Line, Text, Gradients, ...)
• Customizable arrows between all objects
• Zoomable Canvas
• Runs on Windows, Mac and Linux