Note: This section of my Website is no longer maintained.
Compared to Tripwire, L6 is "lighter, faster, and simpler". You can read the original announcement. Or check out the L6 homepage where you can download it.
Or, you can get my local copy. (Don't forget to verify that I didn't modify this. Use the MD5 and SHA checksums file.
Interestingly, the author claims to get 40% increase in speed using this Perl program vs. it's C equivilent.
You will need to get the MD5 and SHA Perl modules for this program.