Free simulator for RF circuits

Hi all!
I want a freeware version of a spice simulator to check some RF circuits -to get a base-point results.

Can you suggest any good one ( for the freeware characteristics)?

Thanks

There is a bunch of free spice simulators out there (just google it) but if you want to analyze RF circuits using a frequency domain simulator (SPICE is a time domain one) I will give QUCS a try. It's a bit ADS biased but I find it very useful (and I'm an ADS user)
Good luck

http://qucs.sourceforge.net/screenshots.html
http://www.linear.com/designtools/software/ltspice.jsp