1.Auslogics Disk Defrag is a free and extremely fast disk defragmenter that will speed up your computer by optimizing file system, for me its far better than our original Defragmenter and most of the other similar software's.Easy to use,fast fragmentation,less CPU usage are its plus features.


2.CCleaner is a tool to clean your system from temporary and unnecessary files that accumulate over time. This also includes rather thorough cleaning of Internet and PC usage tracks like browser cache, recently used files, web sites visited and more.

3.Internet Download Manager (IDM) : Internet Download Manager (IDM) is a tool to increase download speeds by up to 5 times, resume and schedule downloads. Comprehensive error recovery and resume capability will restart broken or interrupted downloads due to lost connections, network problems, computer shutdowns, or unexpected power outages.Download videos from any video-site e.g.YouTube,Metacafe,Stagevu etc.
Plus point :It really provide the above features.I can assure you that it's the best download manager available till now.

*Do post your comments if need info. about downloading these software's.