If perhaps you're looking for an AV program for your Mac, the following article from Macworld provides a review of several anti-virus programs:
Some might feel an AV program isn't necessary on a Mac, but if an AV program is effective, free, and has a minimal impact on a computer's performance, I don't see any downside to using one. Why not run one, I ask myself? It doesn't hurt, and it might help.
In this particular article the free version of Avast is recommended. Avast usually comes out well in AV tests, and I've used Avast for years.