Is there a tool, preferably free, that will show me all direct flights from an airport?

The search engines I frequent (ITA, Kayak, travelocity & similir, etc) dont show all airlines like Southwest.

I'm currently using flightstats but it's a bit of an exercise to process the info. I'm not really looking for the individual flights but where I can go nonstop on any airline.

Example, search for Memphis, TN (MEM) and it just say I can get to these 10 cities via these airlines.