NetMeter is designed for those guys who wish to know their upload and download speed. If you want to know whether you have made full use of your bandwidth traffic, NetMeter is your ideal choice.
Stellarium is a free open-source desktop virtual planetarium software, supports Unix/Linux, Windows and Mac OS X platforms. It uses OpenGL to render the stars in real time, and generate a virtual 3D sky on your desktop, so the stars effect is almost completely the same as you observe the stars sky with only naked eye, telescope or astronomical telescope.
CutePDF Writer (formerly known as CutePDF Printer), after installed, it is equivalent to install a virtual printer driver (printer subsystem).
In order to protect the data security, we have to use some encryption softwares, but in so many such programs, of all, the best one has to be TrueCrypt who satisfies comprehensive functions, strong encryption ability and easy to use these three excellent conditions at the same time!