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.
Psensor is a graphical hardware temperature monitor for Linux. It can monitor temperatures of the different hardware sensors (motherboard and CPU using lm-sensors), hard disk drives (hddtemp/libatasmart), and ATI/Nvidia GPUs. The fan can also be monitored (lm-sensors). Psensor is designed to be simple and easy to use.
MojoMojo is a Web2.0 wiki with AJAX live preview, hierarchical structure, tags, diffs, pluggable syntax, permissions/ACL, attachments, RSS feeds, a photo gallery, edit conflict resolution via 3-way merge, themes/skinning, localization, built-in full-text search, and a reverse index. Since it's built on top of the Perl Catalyst Web framework, MojoMojo supports any Web server, and includes its own standalone one. It also support any database backend supported by the DBIx::Class ORM, and has been successfully tested with PostgreSQL, SQLite, and MySQL.
Ailurus is an application which tells its users about tricks for enhancing their use of Ubuntu Linux. It puts tricks in tool-tip text and a "Tip of the day" window. It also displays information about the system's BIOS, motherboard, CPU, and battery. It has an interface for changing some GNOME settings. It can install and remove some applications which are not provided in the official Ubuntu apt repository. It can detect the speed of apt mirrors and find the fastest one. It can enable and disable some third party repositories.
Ridual is a dual-pane file manager for GNOME. It features tight integration with GNOME (providing GVFS mount support, bookmarks and user directories, a removable drives list, file icons, and application associations), keyboard-oriented control (with adjustable shortcuts for everything, single-window dialogs, and messages), and advanced tasks and queues management.
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.