is there any circuit simulator like thing for linux
 

can somebody please tell me if there is one
I need it to implement(and/or simulate) my circuits.
thanks in advance.......

Hello,

Yes. The program is called Qucs. Just type:

I hope that this helps.

There's a bunch according to freshmeat: http://freshmeat.net/search/?q=circu...&Go.x=0&Go.y=0
including ngspice.