Free usability software for linux

mkvtoolnix is a set of tools that allow users to display information about, extract streams from, merge several streams into, and split Matroska media files. Supported video stream types include streams from AVIs, Ogg/OGM, and RealVideo files.
Supported audio formats include Vorbis, RealAudio, MP3, MP2, FLAC, AC3, and AAC. Several subtitle formats are supported, including SRT, SSA, ASS, VobSub, and many others.
The resulting files from mkvtoolnix can be played back with various media players on Linux/Unix or the Matroska Direct Show filters under Windows.
Enhancements:
- This release fixes a couple of issues with the AVC/h.264 support, changes the defaults so that the annoying "NALU size length" error message does not appear anymore, and features a few usability enhancements.
- It is now possible to create files in which no track has its "default track" flag set.
- Support for 14-bit coded DTS files was added.

gcolor2 is a simple color selector that was originally based on gcolor, ported to use GTK+2, and now has a completely new UI.
Enhancements:
- Improvements include usability / UI enhancements, and sortable columns.

Deskweb applies the iconography and usability of a common Windows desktop system to Web applications.

Deskweb is familiar and user-friendly and lets users easily learn how to exploit all of the softwares features.

It can be used in various ways, such as a content management system, a company groupware, a wiki, or more.

Now you can run Torsmo in KDE! well, not really, but close enough. KaTorsmo is a Karamba theme that looks like Torzmo.

KaTorsmo is very simple and clean. No icons or ugly graphics. Just plain simple usability! Torzmo style!

The Process count does not work yet. The hostname and IP address does not work yet.

Lucidity hopes to become the next generation graphical user interface focused on speed and usability.
Lucidity is being developed in Ruby and at this point Im the only developer. Although not much information is given on this site (right now, that is) I have a pretty good idea of where Im aiming towards with this interface.
Enhancements:
- This is a (testing only) local chat application that allows two or more instances of a chat application to communicate with each other.

SCAP-Java is an automatic thematical mapping software. It draws colors or symbol maps from your data, with step by step procedures coherent with the cartography semiology methodology.

SCAP-Java was developed for education and map production, with an emphasis on usability: its easy to create a PDF map from spreadsheet data and geospatial datasets (mif/mid).

Clearlooks is a GTK+ 2.x engine written in C that transforms your GNOME/XFCE desktop into a modern looking environment. Clearlooks 2 is fast and easy on the eyes.

Clearlooks is an attractive gtk engine with a focus on usability.

Clearlooks will transform your GNOME desktop into an attractive looking and usable environment.