You didn't misread, that's the name of an official Esri blog entry, Going Open-Source with Esri.
From the entry: "We’ve also been a big supporter of the open-source community, providing code and sponsorships for efforts relevant to the users of our system. Popular tools such as GDAL/OGR, PostgreSQL, Dojo, MongoDB, and others have all been actively supported by Esri. We are embarking on a new set of initiatives to subtly change from contributing to the various open communities to being more active members of these communities. […]
The software that we are publishing as open-source cuts across many domains – not just the web. There are mobile phone libraries and applications, desktop extensions, big data analytis tools, and of course many web application templates in ActionScript, Java and JavaScript. Right now there are nearly 50 repositories at github, and we have a lot more that we are getting ready to release. […] You can see my slides on Github."