Free usability training software for linux

Chess Training Tools is a collection of chess training tools. It includes a chess visualization trainer that teaches chess visualization by drilling you on the color of a particular square, and also on your ability to tell if two squares are the same color, if two (or three) squares are on the same diagonal, if two squares are a knight move apart, or if two squares are two knight moves apart.
This is a program that I wrote for my own use to improve my chess visualization ability. I decided to share it with other players, since I believe they can benefit from it. It basically helps you remember what color the squares are, how the pieces move, and so on, all in your head.
It does so by posing you various excercises that, if practiced every day, will let you visualize positions without the aid of a board.
I use this tool every day. You may want to use it the way I do, or you could develop your own method of training. I work my way through the panels, doing 20 of each excercise. I proceed Color->Same Color->Diagonal 2->Diagonal 3->Knight->Knight 2->Mate.
Then, after all of that I play a game against Vince. Start slow, by either lagging the display by one ply, or by blanking out one quadrant. Work your way up to the 7 ply and four quadrants.
Enhancements:
- This release added undo, or move takeback to the PlayTest ("Vince").

striim is an Internet radio player for GNOME.

striim allows you to play and manage Internet radio stations with ease. It plays pls files and supports the Shoutcast protocol. striim demands no attention or configuration. It is designed with simplicity and usability in mind.

This project is Free Software licensed under the terms of the GNU GPL.

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.

gtrainer is a simple tool for manage sports trainings.
Program written in Gtkmm to manage sports trainings. It can store differents records about your daily training:
- Daily weight
- Characteristics of your exercise like: kilometers a day, hours a day, temperature, the route, etc.
- Specific training sessions: series, recoveries, heart rate, etc.
With the routes interface you can save your favourites routes as well. Find the largest route, or the hardest one easily.
You can save these records locally (sqlite3) or remotely (PostgreSQL, MySQL soon). You will know exactly how your training goes, with different kinds of charts and monthly reports, in order to improve your results or just as a curiosity.

Althea IMAP (Internet Message Access Protocol) e-mail client for X Windows. The design goal was a stable e-mail client with the richness of usability of Microsofts Outlook, Qualcomms Eudora, and Cyrusofts Mulberry.

Installation:

Type the following commands:

# unzip and untar althea-x.x.x.tgz
tar xvzf althea-x.x.x.tgz

# make and install the program
make
make install

ILIAS project is a platform for Web-based training.

It is being developed at the University of Cologne, in Germany, using PHP and MySQL.

It has been available since September 2000 as open software software under the GPL.

The systems core is an authoring tool for creating courses.

Other main components include personal desktops, a mail system, newsgroups, a group system, and system administration.

Wacky Sleigh Ride is a free 3D Christmas fun racer.

Wacky Sleigh Ride (WSR) is a Christmas fun-racer. You can show your driving skills on three different courses either in training mode or mulitplayer against other players!

WSR is created with the TORQUE GAME ENGINE from GarageGames.com.