Open Source Mac / Windows is dedicated to evangelizing free and open source software for Mac OS X, Windows and other platforms. Its aim is to perform a service to both users and developers of free and open source software for all platforms (including proprietary platforms, such as Mac OS X and Windows, and open source platforms such as GNU/Linux and BSD).
Over the past years, the Open Source Software movement has gone from producing projects that are technically interesting, or useful for teaching purposes, to producing robust and powerful software which only experts can use, to producing high quality software that is as powerful and easy to use as comparable commercial software.
The Open Source Movement owes its existence to programmers who, for a wide variety of reasons, have chosen to put their effort and talent into producing outstanding software. For the Open Source movement to continue to thrive it needs users, because users push development forward.
Perhaps the single best-known open source project is Linux (often referred to by Open Source advocates as "GNU/Linux" because Linux is only useful in combination with a large constellation of software contributed by the GNU project). Linux is an Operating System, and while an OS is useful, most users are focused on applications, such as Microsoft Word or Adobe Photoshop. Among the best examples of Open Source Applications are such programs as:
Each of these programs is free (you can download and use it for free), open source (you can see the source code and modify it if you need to), standards compliant (it doesn't create bizarre files only it can read), and comparable in functionality and stability to equivalent commercially developed software.