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.

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.

Super Mary Cat (the original Japanese name: しょぼんのアクション, AKA: Open Syobon Action) is a kuso version of the classic Super Mario game, when gaming there are too many challenges waiting for you, this let us complain about the author's tricks, meanwhile, we can't help feeling so much interest. Just because of this, Super Mary Cat has become a must-play Super Mario remake for its fans.

Foxit PDF Reader is a small, fast and clean PDF reading tool, which can completely and perfectly replace the famous Adobe Reader. By contrast, Foxit Reader is the absolute winner (faster, smaller, cleaner, easier to use), and it is 100% free.