BleachBit deletes junk to recover disk space and maintain privacy. It rids your system of old junk including cache, Internet history, temporary files, unused locale files (better than localepurge), logs, and cookies. Designed for Linux systems, it wipes clean 50 applications including Adobe Reader, Bash, Firefox, Flash, OpenOffice.org, Opera, Real Player, Skype, and more. It shreds files so that they cannot be recovered, and it wipes free disk space to hide insecurely deleted files. It offers both a simple PyGTK GUI and a command line interface for automation.
Booktype makes it easier for people and organizations to collate, organize, edit, and publish books. Delivering frictionlessly to print, lulu.com, and almost any ereader, Booktype facilitates collaborative production processes, with no more lost manuscripts, overwritten Word files, awkward wikis, or cumbersome CMSes.
COMPO is a graphical design application for Ubuntu/Debian. It allows you to design and position graphical and text objects on defined areas of a larger page. You can use it to make business cards, labels, folded fliers, etc. Different compositions can be placed on different target areas of the same page, and non-grid layouts are supported.
CryptBackup is an encrypted backup application for Linux desktop users. It allows even a layperson to backup their home directory (including the desktop) on an encrypted external device with just a few clicks. Even the setup is only to choose the external device (such as an external hard drive) and to set a password.
debshare.create is a hackish script used for producing .debshare files, which are basically "self-executable", monolithic archives containing several .deb packages. A .debshare file is meant to install one (or more) applications that it contains, complete with all its dependencies. This facilitates easy sharing of applications across computers using a single file, as opposed to multiple .deb packages. This idea was originally meant for Ubuntu systems, but there should be no reason why it shouldn't work on other similar distributions. Technically, a .debshare file is a bash shell script with a binary payload (a tar archive with the .deb-s) appended to it.