Agree with Ian…
I think the correct approach is that open source software can be openly announced, after all, in some sense it is a gift to the community. Open source offerings are permanently represented under the Tools menu on the website. For commercial activities, including those that use open source, there is the Industry partners programme, which leads to vendors being represented here on the website.
There are undoubtedly better ways to announce and present these kinds of information, and as ever, suggestions to do so are welcome.
- thomas