Free Registry Cleaner = CCLEANER (please search for the latest download site)
DimDim = A free web conferencing Tool
Q-Dir = A Free directory utility that is great! (please search for the latest download site)
Secuina Personal Software Inspector (please search for the latest download site)
Free Online Sharing of files = DropBox
Windows Free Scheduler= WinCron at download.com
Also, check out the Open Source information page. Great programs there.