WordPress is an open-source content management system for websites that I use very often for my personal projects and client work. In fact, it powers this site as well. Recently there was a very contentious and public spat between Matt Mullenweg (original co-developer and primary frontman for WordPress and CEO of Automattic) and Chris Pearson (developer of Thesis, a commercial WordPress theme). The argument was over whether Thesis should be at least be partially licensed under the GPL (the license WordPress uses). I’m not going to rehash all the stuff that was said but my opinion is that yes, WordPress themes and plugins are GPL.
This is kind of a follow up to the WordPress post I made a couple of days ago. Well recently, MovableType (MT), another blogging/CMS application in direct competition with WordPress, announced a major new version (4.0) that would be completely open source. Note that WordPress is already open source as well. This is a departure in that previously MT was only free for personal use and was limited in terms of number of users per installation. They also had paid commercial licenses and what not. A lot of people are talking about this and MT themselves spew a lot of marketing speak about how they’re doing this to empower bloggers, etc. But I really don’t think that’s the real reason.