As we know, open source software companies provide original source code that is free and available to be redistributed and modified. These organisations rely on communities of developers to write, improve and inspect their code with the intention of turning those users into customers, by providing support services to those using the free open source code.
While organisations like Red Hat, SourceForge and OpenStack have written the rule book when it comes to open source software, more and more companies are promoting open source strategies, most notably Apple, which open sourced its programming language Swift in 2015.
This list will be regularly updated so if we've missed one you think should get a mention, let us know.
Here are 13 open source companies to watch this year.