Stellarium is a free open-source desktop virtual planetarium software from France, 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.

Apache OpenOffice (short for AOO, formerly known as OpenOffice.org, also called OOo), long time ago, its predecessor is the commercial Office software - StarOffice, now, it is a set of open-source, cross-platform office suite, supports a variety of operating systems (Windows, Linux, MacOS X, Solaris and so on).

About the third-party image browser in our PC, a lot of us may know the ACDSee, although it is really very strong, unfortunately, it not only costs too much, but also is too big with not many functions, and the key point is that we do not have to use it to view pictures. Because some other app is free for use and even more powerful than ACDSee.

7-Zip, believe that a lot of people heard of it, but few of us really used, just because we are accustomed to the most common WinRAR and the once - great WinZIP. Anyway, 7-Zip is the one which currently has a extremely high compression ratio archiver (developed by Igor Pavlov from Russia), this also is the most important technical characteristics measure for such applications. In addition, 7-Zip releases based under GNU LGPL , so it is open source and free.

Launchy is a free, open-source Windows desktop enhancement tool, it can arrange a strong "Run" bar on your desktop, you can start the computer program, file, folder and bookmark simply by way of entering some keywords, very fresh and very smart!