Where can I download Anti- virus software free for my Mac? (or Spyware protection?)?

I have checked all the anti-virus sites on the internet and all the spyware protection, but they were all for windows. I found something called ‘zebra scanner’ and downloaded it, but It was really weak.
What is something for my Mac?

Use Avast Anti-Virus. I used this program, and it found viruses on my computer that were slowing it down, that I didn’t even know were there! Best of all, it’s completely free.

http://free.avg.com/

Mac VS PC Spyware Detection

SPY NET: Stealth Video Glasses $16.49 They may look like regular sunglasses, but Spy Net Video Glasses are the ultimate spy tool packed with high tech spy features! Spy Net takes high end electronics and interactive gadgets and puts them in the hands and on the wrists of burgeoning young secret agents. For undercover surveillance, detection and communication, Spy Net provides all the technology you’ll need to tackle any secret mission…

Spy Net: Flex Neck Snake Cam $10.89 Do you have what it takes to be a super spy? Real working spy gear! Become the secret agent you’ve always dreamed of being!Spy Net products take high end electronics and interactive experiences and put them in the hands of burgeoning young secret agents! With this Spy Net Flex Neck Snake Cam, you can record video from around corners, while staying hidden from sight! Order today, and create your o…