Version 1.91 (GTK3) of the powerful terminal emulator Terminator was released yesterday, bringing a few enhancements, as well as numerous fixes.

Terminix is a GTK3 tiling terminal emulator. The application allows splitting terminals horizontally and vertically, arranging them using drag'n'drop, save and restore terminal layouts and more.

The so called "Quake" mode feature is also supported. Using this, Terminix behaves like a drop-down terminal, invoked and hidden using a key.

Plotinus is a library that adds a searchable command palette to any GTK+ 3 application, similar to the Atom and Sublime Text Command Palette feature (or Unity HUD).

As we pointed out a while back, the Audacious developers aren't very happy  with GTK3 and for the latest Audacious 3.6 alpha 1, released recently, they've switched back to GTK2 by default. 

Also, since the long-term goal is to completely switch to Qt, Audacious 3.6 alpha 1 includes a new Qt5-based user interface which is already usable, but not as feature-rich as the GTK+ interface. The new Qt interface can be installed alongside the already existing GTK+ and Winamp Classic interfaces.

Starting with GNOME 3.10, some GNOME applications have switched to "header bars" or "client-side decorations". These CSD (client-side decorations) don't work properly in some desktop environments / shells - for instance, in Ubuntu 14.04, Unity doesn't support CSD and because of this, some applications look broken. Luckily, there is now a relatively easy way (unofficial) of disabling client-side decorations. Read on!

Moka started as a single icon theme but it has evolved into an entire project which includes multiple GTK and icon themes for the Linux desktop as well as icon themes for Android, all designed / developed by +Sam Hewitt.

Starting with version 3.2, GTK+ comes with an experimental "Broadway" backend that allows rendering GTK3 applications in HTML5-capable browsers, so you can run applications remotely, using only a web browser.

Ubuntu doesn't enable this Broadway backend by default, but thanks to Nicolas Delvaux's PPA, you can easily give this a try in Ubuntu 13.04, 12.10 or 12.04.

Besides the new color variations, the latest version comes with other changes, including many redesigned widgets, new progress bar style, many fixes and also, it's no longer required to make any changes to use the themes in GNOME Shell or Unity.

DeLorean Dark is a beautiful GTK3 theme that supports the latest GTK 3.6. There's also a GTK2 theme available, which has been completely redesigned recently.

Also, the theme isn't just for GNOME (this includes Unity, Cinnamon, etc.), there are Xfce and Openbox themes available as well.

Here are some DeLorean Dark screenshots:

The latest Synaptic Package Manager from BZR has been ported to GTK3 and the new version will probably be available in the Ubuntu 13.04 repositories. Since many of us are still using Ubuntu 12.10 or 12.04, I've uploaded the latest Synaptic with GTK3 support to a PPA so you can easily install it.

Gnome Cupertino (previously known as Adwaita Cupertino) is a GTK2/3 theme pack based on the colors of Mac OSX Snow Leopard and Lion, each with variations optimized for either GNOME Shell or Unity.

GTK themes need to be updated to work with each new major GTK version, and because of this, some beautiful themes available for GTK 3.2 or 3.4 like Zukitwo and others, don't work with the latest GTK 3.6 available in Ubuntu 12.10 and other Linux distributions.

There are, however, a few cool themes which work with the latest stable GNOME / GTK (3.6). Below you'll find 8 GTK3.6 compatible themes which are available in PPAs / repositories for Ubuntu 12.10 and work with both GNOME Shell and Unity.

The Faience pack has been updated today with new and improved icons for the icon theme, GNOME Shell 3.6 support for the GS theme and there's also a beautiful new GTK3 theme.