Most recently, Roseman (pictured on the right, with Zynga’s CEO Mark Pincus on the left) oversaw last month’s launch of Zynga’s social games platform.

The platform, code-named “Project Z,” enables games to be played directly on Zynga.com, rather than through Facebook, making it an important strategy for the company as it seeks independence from the social network.

In addition, Roseman also served as the manager of the San Francisco-based company’s office in Seattle, where he helped to recruit engineers.

When reached by phone, Roseman briefly confirmed that he had left the company about three weeks ago, after the launch of the platform.

Roseman said one of the main reasons he was leaving was because he spent three to four days a week in San Francisco, and was looking forward to spending more time with his family in Seattle. He has not decided what to do next, but said he is looking forward to something entrepreneurial.

Before joining Zynga, Roseman was CEO of Evri, a semantic Web start-up funded by Paul Allen; before that, he was one of Amazon’s first engineers.

Zynga declined to comment on Roseman’s departure, but confirmed that Jim Veevaert is now managing the Seattle office. Previously, Veevaert was president of Jerry Bruckheimer Games, a games studio founded by the famous Hollywood producer; he also worked at Microsoft for more than seven years.

In January, Zynga told me it employed 50 people in Seattle and was hiring.

Since the Seattle office’s open house in April 2011, it has grown significantly.

To help attract talent over the past year, it acquired Gasworks Games and CupidsPlay, two Seattle-area companies. CupidsPlay developed a game that merged social games and online dating, which I’ve written about. The two acquisitions are fairly minor, and were primarily for talent.

According to LinkedIn, Gasworks Games’ co-founders Toby Gladwell and Andrew Kaplan have been working at Zynga for the past several months. Likewise, the co-founders of CupidsPlay Diwakar Gupta and CJ Huang have updated their profiles to reflect that they’ve been working at Zynga’s Seattle office for the past year.

Most recently, the Seattle game studio helped to launch Slingo on Facebook.

But–as many readers have requested–they will all be available in their entirety in this column.

In the less contentious spirit of DEMOfall and TechCrunch50, two demo conferences taking place simultaneously this week, we’re happy to bring you all the demos we had onstage at D6.

Next up is evri, the semantic Web guide start-up, which is backed by billionaire techie Paul Allen.

There are two videos showing the whole demo below.

In the first one, evri Founder Neil Roseman talks about the application that graphs the Web via grammatical information. He uses it to discover info about and people related to Sen. Barack Obama, for example, which is done in a “horizontal” manner. He somehow ends up at “Sex and the City” star Sarah Jessica Parker.

In the second, Roseman finds content about Walt Mossberg and me, as well as celebrity Rachael Ray, and talks about the business plan and inspiration for evri.