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Contribute by topic

Find ways to contribute, and connect with others with shared interests.

MediaWiki and extensions

MediaWiki is the software that powers Wikipedia, its sister projects, and thousands of wikis all over the world.

Localization and internationalization

Write code that can be localized, get your code translated, and contribute to making Wikimedia technology multilingual.

Mobile apps

Expand the reach of Wikimedia content by contributing to mobile apps for Wikipedia, Wikimedia Commons, and other projects.

Documentation

Read the documentation style guide, and find good first tasks for improving documentation.

Offline reading

Expand the reach of the free knowledge by helping people use Wikipedia without internet access.

Infrastructure

Contribute to the infrastructure that powers Wikimedia projects. Help improve the performance and efficiency of Wikimedia servers and software.