Support for Registry Cleaner is available from the publisher site.
Short description: Digeus Registry Cleaner is a PC maintenance and recovery tool that eliminates system error messages, slow startup and shutdown speed, programs instability and computer crashes....
To speed up your downloads we recommend you use a download manager such as 
Cleanse is a program uninstaller that will find and remove even the most stubborn of programs. Using the smart Auto Find drag and drop function uninstalling has never been so easy. Uninstall programs even if they don't supply an uninstaller.
WinQuota is a disk quota management solution for Windows designed for regular usage on any types of servers, especially on servers with large amount of files, such as file servers, news and mail servers.
EF System Monitor is a Windows program that shows you comprehensive information about your local or remote (over TCP/IP) system resources and performances. Multilingual. Shareware
Filedoyen is a single or dual-pane file and archive (zip) manager with integrated text, code and hex editors, file and folder compare and search. By combining these separate tools into one, Filedoyen makes file management both convenient and easy.
Sniff out wasted space with The Best Duplicate File Finder available. Space Hound 4 eliminates duplicate and unused files that are cluttering up your hard drive and causing problems. Uncludes File & Directory Management, Zip & Unzip, file Viewers.
Print and visualize your folders. Find out where your HD space went! You can filter to include only the files you want and customize both display and printed output to your taste. Lists can include MP3 and ZIP information.