Free Assorted brushes at brusheezy.com

Here you will find cool brushes from mythology, schematics, abstracts, grunge and many more! You can also search through the available version and also by category. You can view the site here.

Free Grunge Brushes at photoshopforce.com

This brush set is great for dirty images and somewhat creepy. There are only 2 packs of this but it has a high resolution. Its free although you have to register to the site. You can download it at photoshopforce.com

Free Abstract Brushes at getbrushes.com

A cool collection of brushes if you want to create an abstract masterpiece. You can download it at getbrushes.com. There are 12 packs and each of which has its own theme. These brushes are free to use for all those who want to.