With free software you're pretty limited. You also need to bear in mind safety considerations such as the availability of BAM maps, their reliability and the level of control you have over the beams so as to prevent them from going where you don't want them to.
If you can afford 500 Euro / 600 dollars then Pangolin Quick Show is the software for you. Powerful and very easy to use. Easy tracing facility, ideal for those logos with instant display of the result or the ability to save it into a cue. Easy to resell for almost the purchase price and very upgradeable. There's a free demo downloadable here:
http://www.pangolin.com/_Files/Setup_QS2_Ev.exe
Failing that and if you want to be towards the free end of the market, there's Spaghetti for around $100 and there's your free options.
BTW I haven't mentioned LSX here as the OP wants live play and doesn't sound like he wants anything too complex.