A very efficient tutor.
A touch typing tutor very flexible, supporting customizable keyboard layouts. You can edit and save new or unknown keyboard layouts, as the basic course was designed to not depend on specific ones. Also, there are some charts about the learning process.
Free flexible open source todo manager featuring hierarchical tasks
Task Coach - Your friendly task manager. Task Coach is a free open source todo manager. It grew out of frustration about other programs not handling composite tasks well. In addition to flexible composite tasks, Task Coach has grown to include prerequisites, prioritizing, effort tracking, category tags, budgets, notes, and many other features. However, users are not forced to use all these features; Task Coach can be as simple or complex as you need it to be. Task Coach is available for Windows, Mac OS X, and GNU/Linux; and there is a companion iOS app.
OpenEMR is an open source medical practice management application (EHR EMR PMS) featuring fully integrated electronic health records, scheduling, electronic billing, internationalization, free support, a vibrant community, and a whole lot more.
Scrabble3D is a highly customizable Scrabble game that not only supports Classic Scrabble and Superscrabble but also 3D games and own boards. You can play local against the computer or connect to a game server to find other players.
GPRename is a complete batch renamer for files and directories coded in GTK2-Perl.
Claws Mail is a GTK+ based, lightweight, and fast e-mail client and newsreader. Supports POP3, APOP, IMAP, SMTP, SMTP AUTH, NNTP, LDAP, multiple accounts, spell-checking, addressbook, SSL, GPG, filtering, i18n, & more. It is further extended by plugins.
Natrix simple IP calculator (Qt GUI)
Generic IP calculator tool written on Qt framework with ability to calculate parameters of IPv4/IPv6 networks, and convert simple numbers from/to HEX/BIN/DEC and conversion between bytes and it's derrivatives. Supports localization with *.qm files (Qt Linguist). For Ubuntu users packages available in PPA for trusty and utopic: https://launchpad.net/~svyatoslav-vorona/+archive/ubuntu/tools ...to add PPA in system just issue: $ sudo apt-add-repository ppa:svyatoslav-vorona/tools For Arch Linux users available in AUR (Arch User Repository): https://aur.archlinux.org/packages/natrix-calc/ For Chakra GNU/Linux users available in CCR (Chakra Community Repo): http://chakraos.org/ccr/packages.php?ID=7006
Association Subscribers Manager allow any association you might also call it "clubs" (like sports clubs or art clubs) to manage easily a large number of subscribers. It runs on GNU/Linux, Mac OS X and windows systems thanks to the Qt 4 framework.