Acorn

Acorn provides a rich set of image editing tools, which give you a wide range of possibilities. The application is a good contender to other advanced image processors, like Photoshop. It allows you to perform various operations, from simple adjustments to advanced transformations. Also, compared to other similar applications, Acorn uses less resources and it's cheaper.

The application comes with a modular user interface. The main editing area, the tool pane and a tool adjustments pane can be found on separate windows. Once you import an image, which can be in almost any format, you will have many options to choose from. You can bring up options for adjusting the picture's levels and curves, create layers and change their blending modes and much more.

Besides choosing from a wide range of presets for the brush tool, you can also create your own brushes. Acorn's built-in brush designer contains numerous controls, for adjusting the brush's size, spacing, softness and other characteristics. You can also choose a blending mode for your brush, opt for smooth lines and more. The application allows you to try out your custom brushes on the brush designer's window, so you can make sure that your adjustments are good.

You can find many other useful tools for your images, including customizable filters, various shape drawing and editing features and others. Furthermore, Acorn comes with native support for Apple's Retina display, which can make your images look much better on a MacBook Pro.