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Wikimedia believes that knowledge should be free for every human being. We prioritize efforts that empower disadvantaged and underrepresented communities, and that help overcome barriers to participation. We believe in mass collaboration, diversity and consensus building to achieve our goals. Wikipedia has become the fifth most-visited site in the world, used by more than 400 million people every month in more than 280 languages. We have more content projects including Wikimedia Commons, Wikidata, or Wikisource. We also maintain the MediaWiki software engine and a wide collection of free and open source software projects around it. Those software projects use a variety of technologies and languages, such as PHP, JavaScript, node.js, CSS, Lua, Java, Objective-C, or C++, to mention a few. But there is much more we can do: stabilize infrastructure, increase participation, improve quality, increase reach, encourage innovation. You can help to these goals in many ways and become part of an international community!