Oxygen is a project mainly written in PHP, it's free.
A basic theme for Drupal using the peroxide theme engine.
The peroxide theme is a basic theme using the peroxide theme engine. The end goal is to make this a powerful base theme for quickly building out entire Drupal themes.
To use the peroxide theme you must download and install the peroxide theme engine which can be found at https://github.com/codeincarnate/peroxide