I'm a big advocate of mind mapping as a Frugal Prosumer Tool. Here is a free one.
Mindmup is clean and simple. As they describe, it allows for frictionless capture of ideas and projects. It is not bloated with unneeded features. The UI stays out of your way and lets you get your ideas out.
Mindmup saves to the cloud and provides Google Drive integration. You can share your maps with others, and even embed them in your website.
If you are looking for a free and quick way to create a mind map, try out Mindmup.