Umbraco Alternatives for Linux

WordPress is an open source content management solution based on PHP maintained by Automattic which is also being offered as hosted solution.

ProcessWire is a free PHP open source CMS with a great API built to save you time and make development fun at any scale.

Ghost is an open source publishing platform which is beautifully designed, easy to use, and free for everyone.

Tiki Wiki CMS Groupware or simply Tiki, originally known as TikiWiki, is a free and open source Wiki-based content management system and online office suite written primarily in PHP.

django CMS is a free and open source content management system platform for publishing content.

Redaxscript is a modern, ultra lightweight and rocket fast Content Management System.

SilverStripe is a free and open-source Content Management System (CMS) and framework for setting up and maintaining websites and web applications.

Jekyll takes your content, renders Markdown and Liquid templates, and spits out a complete, static website ready to be served by Apache, Nginx or another web server.

CMS Made Simple (CMSMS) is a free, open source (GPL) content management system (CMS) to provide developers, programmers and site owners a web-based development and administration area.

TYPO3 is a free and open source web content management system written in PHP.

Octopress is an obsessively designed toolkit for writing and deploying Jekyll blogs.

Novius OS is a content management system (CMS) open source.

GetSimple CMS is a free web Content Management System with the primary goal to be simple and easy to use.

Chyrp is a ultra-lightweight ultra-flexible blogging engine with a fetish for birds and misspellings.

Symphony CMS is a XSLT-powered open source content management system.

Pimcore provides free and open-source customer experience management, digital asset management, product information management, multi-channel publishing and e-commerce software.