Some are open source, some are commercial products but free to download and use, and others require a commercial license.

其中一些是开放源码的，一些是商业产品，但是可以免费下载和使用，其他平台需要购买商业许可证。

youdao

Most popular open source solutions are extremely well documented and a variety of free and commercial technical support options are available.

很多流行的开源解决项目都有绝佳的文档以及一大票免费和商业的支持选择可以找到。

youdao

Completely open source and free for commercial use.

完全开源和免费用于商业用途。

youdao

Net, which promises a commercial free, real-time socially driven information stream with an open API for developers.

FORBES: A Paid Subscription to Facebook, Twitter?

According to Craig Mundie, Microsoft's chief technical officer, as the open-source movement grows, it will get better at producing free clones of commercial software.

ECONOMIST: Software

Sanchez said that not only is the license unclear, but corners of the open source community have little or no interest in working with commercial entities to integrate proprietary and free software.

CNN: Apple warms up to open source community