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.
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TextDiff is an open-source file and folder comparison tool, compared with the commercial software or shareware, although a little weaker on the functions, yet it has been completely enough to meet the needs of general comparison (including modification).
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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).
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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!
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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 whihc currently has a extremely high compression ratio archiver, this also is the most important technical characteristics measure for such applications.
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Notepad++ (also called Notepad plus plus) is a very distinctive open-source pure text editor. Its function is much stronger than the Windows built-in Notepad editor, besides can be used to make a general pure text file, it is also suitable to write computer programs for programmers as a source code editor.
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VirtuaWin is a small, fast virtual desktop management tool, it can simulate multiple desktop (as many as 9), and you can add the process management, wallpaper replacement functions and so on by installing plugins from official website.
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