iRobot may be best known for the floor-cleaning Roomba, but here’s the company’s full story: Revenue climbed by roughly $50 million in 2013 to almost $500 million, and investments in new technologies totaled $60 million. "We take an extremely long view of our role in the robotics industry," says CEO Colin Angle. iRobot is ensuring its place in a mechanical future by researching and releasing new products and capabilities while still pulling in contracts for its established line of security and military systems. That is to say, its bots are among us. Here are four of the companies notable mechs.