KShutDown is an advanced shutdown utility for KDE. It has four main commands: Turn Off Computer (logout and halt the system), Restart Computer (logout and reboot the system), Lock Session (lock the screen using a screen saver), and End Current Session (end the session and logout the user). It features time and delay options, command line support, panel applet, and sounds.
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.