They have posted about this release on their blog. This is an amazing example of a blog post! It has all the right stuff to interest people in their product and really raises the bar for others when it comes to making an announcement of a free/open source release.
Explanation of why they went free/open source:
We’ve had a lot of interest in the Turbulenz Engine via our SDK packages and many of the people who try it out have praised the features and performance. However, two issues that have often come up are any sort of restrictive licensing and the ease of getting things started.
By releasing the Turbulenz Engine as open source under a standard liberal MIT license we hope to ease the adoption costs and ensure that people don’t feel in any way restricted by using the Engine
How to get started:
If you want to take a look, the best place to start is the README which you can find on the Github project page and included in the source. This details how to set up a development environment and includes a short getting started guide on how to use the Turbulenz Engine APIs. From here we recommend going through the Getting Started guide and reviewing all the documentation online.
The engine is also available bundled in an easy to install SDK for Windows, Mac OS X and GNU/Linux. This might be an easier option if you’re looking for a packaged-up and fully QA’d snapshot of the engine. All future SDK releases will contain the open source engine with the associated MIT license. (Earlier versions of the SDK were released with a partially open license which has now been deprecated.) The bundled SDK is available from the Turbulenz developer service.
How to contribute:
We know there is a large and growing community interested in HTML5 game development and we hope that people will find this project an empowering contribution to game and Internet technology domains. Now that the project is fully available as open source and easily accessible via GitHub all contributions are gladly welcomed. Please send the project a pull request or post a git diff patch on the Turbulenz Engine google group.
Please help spread the word to your friends and followers by sharing this announcement online. We want to make sure that anyone thinking about making a game with HTML5 is aware of Turbulenz as a free and open source solution that comes packed with high performance features.
The impact of these blog posts on your organization’s brand are very positive. With the smallest amount of effort, your organization can be seen as making a valued contribution to the free/open source community and can be seen as raising the quality of their products and services.
Here are some other great free/open source announcements: