Accella

( Baltimore Sun photo by Barbara Haddock Taylor / October 20, 2011 )

Jason King's firm Accella has built apps for the National Archives, Long & Foster and a company that offers a medical job search database. Sometimes, clients want a straightforward mobile presence that's similar to their website; in other cases, King helps them develop an app that's geared toward a specific use or online tool.

In 2008, revenues were $800,000. In 2009, $1.4 million. Last year, revenues topped $1.8 million. And he expects to top $2 million this year.

King is bullish on advances in mobile technology, believing that it will continue to drive a nascent apps economy. "I don’t think people have fully taken advantage of their mobile devices," he said. "They'll continue to get more powerful."