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Afternoon sessions at The Linux Foundation's Collaboration Summit featured Netflix, Intel, Red Hat, Linux Foundation collaborative projects and the Linux weather forecast by Jon Corbet. Here are some of the highlights.

 Keynote presenters had some interesting things to say at The Linux Foundation's Collaboration Summit in San Francisco on Monday. Here are some top quotes. What did you take away from the sessions? Please share your favorite quotes and moments in the comments, below.

Open source leads the data center, says John Mark Walker, Gluster Community leader at Red Hat. OK, what's next? This is the question Walker plans to address in his keynote on Monday at Collaboration Summit in San Francisco, though he hints at the answer in this Q&A.

The Linux Foundation's executive director Jim Zemlin sees a new trend in the technology industry toward a collaborative development model. Companies are focusing their research and development efforts outward and participating more in open source projects to accelerate innovation and progress, he said in his opening remarks at The Linux Foundation's Collaboration Summit in San Francisco.

Listening to Tony Awtrey sing Pie Jesu from Andrew Lloyd Webber’s Requiem is awe inspiring. The classically trained tenor has a euphonious voice capable of taking your breath away. He’s also a Linux developer and Chief Scientist in the defense industry.

“It's just a rehearsal, but I still like it,” Awtrey said of his performance (see the video, below), which he edited with open source OpenShot software on his Debian Linux desktop.

Along with the proliferation of mobile and touchscreen devices, embedded Linux developers have shifted away from building their own operating systems from scratch. Instead they’ve been moving over the past few years toward frameworks such as the Yocto Project, Tizen or Android.

Library technician John Kerr was one of the first Linux community members to add his how-to videos to the 100 Linux Tutorials Video Campaign this year.  The brief screencasts showcase software that he uses everyday in his job at the county court house library for the Wellington Law Association in Guelph, Ontario, Canada.

Now that the Linux kernel 3.9 merge window is closed, it's safe to say we know what features will be included in the next kernel release. What lies beyond is predictable, still, but will likely hold a surprise or two. That's where the annual Linux kernel weather report comes in.

Back in October Adapteva wrapped up a successful Kickstarter campaign to build a Raspberry Pi-inspired $99 Linux supercomputer. Next month the company expects the first Parallela boards to be in production -- just in time to show off at The Linux Foundation Collaboration Summit in San Francisco.

When embedded projects call for for a real-time operating system, Linux developers often turn to PREEMPT-RT, the real-time kernel patch, to get it done.

“The PREEMPT_RT patch (aka the -rt patch or RT patch) makes Linux into a real-time system,” said Steven Rostedt, a Linux kernel developer at Red Hat and maintainer of the stable version of the real-time Linux kernel patch.