MAC OS X Key Logger

I need to install a key logger on my MAC OS X machine. I would prefer something that runs hidden?  Any suggestions?  Are any free?
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norcaltyConnect With a Mentor Commented:
I have not found a really good free keylogger for macs.  Nearly any that I have used were paid software.

I have used refog.

If you have a USB keyboard I think USB loggers are better.  You don't have to worry about the OS seeing it as malware/spyware.   Also it's not tied to a single machine so it can be moved later.
DarinTCHSenior CyberSecurity EngineerCommented:
i have only used the USB ones
got the last for $10-15 at CompUSA store
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