Zero Install is a decentralised cross-distribution software installation system available under the LGPL. It allows software developers to publish programs directly from their own web-sites, while supporting features familiar from centralised distribution repositories such as shared libraries, automatic updates and digital signatures. It is intended to complement, rather than replace, the operating system's package management. 0install packages never interfere with those provided by the distribution.

MuseScore is an Open Source (GNU GPL) music notation software that runs on all platforms supported by Qt5 (GNU/Linux, MacOS X, Windows), and is available in over forty different languages. It features an easy to use WYSIWYG editor with audio score playback for results that look and sound beautiful, rivaling commercial offerings like Finale and Sibelius.

Angband is a single-player, text-based, dungeon simulation derived from the game Moria, which was in turn based on Rogue. It is often described as a "roguelike" game because the look and feel of the game is still quite similar to Rogue (though there are now graphical tiles available if you dislike ASCII gaming). Angband has been in more or less continuous development since the early 1990s.

mail-notification works with system trays implementing the freedesktop.org System Tray Specification, such as the GNOME Panel Notification Area, the xfce4 Notification Area and the KDE System Tray.

xfce4-session is an X11-compliant "session manager" designed for use with the Xfce4 Desktop Environment. On log out, the session manager saves the state of all your running applications. When you log back in, the session manager restores the same applications with the same window positions.

Xpra gives you the functionality of GNU Screen for X applications.