The latest Firefox 4.0 Beta 2 pre brings a long awaited feature: app tabs. This feature is very similar to the "Pin tab" option in Chrome: the app tabs use only favicons for the tabs and all the links you open from an app tab are opened to the right of all the app tabs.

At first it was F.lux. Then came Redshift (inspired by F.lux) which also got a GTK version but only for switching it on/off. And now, a Redshift fork called RedshiftGUI finally brings a GUI for customizing everything. But what are these? All the applications mentioned above serve only one purpose: to change the color temperature of your screen by the time of day, making it easy for your eyes.

qBittorrent is probably the most actively developed Linux Bittorrent client, with new versions being released constantly fixing lots of bugs but also adding nice features to make you forget 

Prpltwtr is a Pidgin (or Empathy) plugin which makes Twitter feel a lot like an IM: you can see yo

Ekiga is an open source SoftPhone, Video Conferencing and Instant Messenger application for Windows and Linux.

Yasst is an amazing cross-platform (runs on Linux, MacOS X and Windows) Twitter client coded in Qt (don't worry - it looks great in GNOME!).

Lugaru HD was a part of the Humble Indie Bundle which allowed users to pay whatever the want for some great cross-platform games.

Some time ago we told you about Sikuli, an application which allows you to automate tasks using screenshots (like recording macros for any application) for Windows, Linux and Mac OSX.

Both Firefox and Opera already released WebM (VP8) capable nightly builds which you can download from here:

Avidemux is a free video editor designed for simple cutting, filtering and encoding tasks. It supports many file types, including AVI, DVD compatible MPEG files, MP4 and ASF, using a variety of codecs.

What's new in VirtualBox 3.2: