Koala is a GUI application for Less, Sass, Compass and CoffeeScript compilation, to assist web developers to use them more efficiently. Koala is a cross platform application that can run on Windows, Linux and Mac OS.

Key features include:

• Support for Less,Sass, CoffeeScript and Compass Framework.
• Multi-language Support.
• Real-time Compilation.
• Compile Options.
• Error Notification.
• Cross-platform.

Koala is a great GUI compiler for pre-processing languages, and currently it supports Less, Sass, Compass, and CoffeeScript out of the box. It has real-time compilation, which means that Koala looks for any file changes, and compiles them automatically; everything is running in the background without user action. Koala can also automatically compress code after compilation has been completed. If, however, Koala encounters an error during compilation, it will display an error message.

The Koala application has built-in compiler components that can be directly used after installation. The Sass compiler function needs a system with Ruby installed, but, if you’re using Koala on the Windows platform it has built-in Ruby anyway. To begin using Koala simply add a project by dragging and dropping a folder into the window, or click on the plus icon in the top left corner and select your project folder.