In a blog post on May 16, Miguel de Icaza announced Xamarin, a new Mono-based product company.

After six years of Qt 4, Nokia wants to modernize its toolkit for 2012 with the Qt 5 release.

The Budapest Ubuntu Developer Summit (UDS-O) kicked off on Monday, May 9, at the Corinthia Hotel. "Accessibility is one of our core values as a project," Canonical founder Mark Shuttleworth said in his keynote address, as he acknowledged the Unity documentation team contributions to the 11.04 release. After briefly looking back at the "Natty Narwhal" Ubuntu release, Shuttleworth set his sights on the upcoming release, saying, "Our goal, our mission is 200-million Ubuntu users in four years."

The Ubuntu Developer Summit for the Oneiric Ocelot (Ubuntu 11.10) development cycle (UDS-O) will take place on May 9-13, 2011 at the Corinthia Grand Hotel Royal, Budapest Hungary.

Red Hat announces its 2012 Summit will be held at the Hynes Convention Centre in Boston Massachusetts on June 26-29.

O'Reilly announces early registration for OSCON, OSCON Data, and OSCON Java is now open. OSCON Data and OSCON Java are scheduled for July 25-27, while OSCON runs the entire week of July 25-29, 2011, at the Oregon Convention Center in Portland.

Nokia announces the release and immediate availability Qt SDK 1.1 as its next step in tools support for Qt based development.

Oracle announces it has submitted a proposal to the Eclipse Foundation to create a Hudson project in Eclipse and contribute the Hudson core code to that project.