Oxygen 4.8 was released and the main feature is the Navigator, which allows you to quickly switch pages, templates, and blocks from within the editor. That addresses a pain point when using Oxygen.

The Oxygen Builder 4.8 beta is available. The main feature is a new navigator for quickly switching between templates, pages, and posts. Being able to switch from within the editor greatly cuts down on the time. The other feature is an improvement to break point unit inheritance for better consistency.

Here is a Meta Box tutorial showing how to create a bi-directional relationship between two Custom Post Types and display them using Oxygen.

From the Oxygen blog, Elijah Mills shares a very nice video showing how to create your own mini CSS framework. The video uses Oxygen and some of its features, but the ideas can be used with other builders.