CCleaner
CCleaner allows the user to remove unused temporary files from Internet browsers and other supported applications along with browsing history, cookies, recycle bin, and AutoComplete form history. It allows for the cleaning of the recycle bin, memory dumps, file fragments, log files, system caches, application data, and various other data. The program also includes a Registry Cleaner to locate and correct problems in the Windows Registry such as missing shared DLLs, unused file extensions and application paths.
CCleaner supports the cleaning of temporary and unneeded files from certain programs, including Firefox, Opera, Internet Explorer, Safari, Google Chrome, Foxit Reader, Microsoft Office (2000, XP, 2003, 2007), Nero Burning ROM, Java, Windows Live Messenger, ZoneAlarm, Flash Player, QuickTime, VirtualDub, Windows Media Player, 7-Zip, Avira AntiVir, Spybot - Search & Destroy, Windows Registry Editor, eMule, KaZaA, Google Toolbar, Netscape, Adobe Acrobat, WinRAR, WinAce, WinZip, and many other applications.
CCleaner assists in the uninstallation process by allowing users to uninstall programs from CCleaner itself. In addition, CCleaner also allows the alteration of start-up programs, similar to the Microsoft Windows MSConfig Utility. Users can disable several start-up programs to free up processor speed at start-up. As of version 2.13.8, CCleaner also allows users to delete System Restore Points.
Eraser also offers secure deletion, including an option to use the 35-Pass Gutmann.