well sorry for cut and paste from wikipedia but they are pretty accurate in this case.
Skil is a brand of power handtools produced by Robert Bosch GmbH. The line traces its heritage to the invention of the portable circular saw, marketed as a Skilsaw. The Model 77 which evolved from it set the industry standard for handheld worm-and-drive circular saws and remains in production almost unchanged today. In an example of a generalized trademark, portable circular saws are often still called Skilsaws or Skil saws.
Skil products include circular saws, cordless drill/drivers, cordless screw drivers, cordless tackers, cordless sealant guns, belt sanders, random orbit sanders, multi-sanders, angle grinders, hammers, drills, mixers, jig saws, lasers and measuring tools, reciprocating saws, routers, and planers.
and here's their home page.
http://www.skiltools.com/Pages/Home.aspxsemp