"SfR Fresh" - the SfR Freeware/Shareware Archive 
Member "blocksshd-1.3/CREDITS" of archive blocksshd-1.3.tar.gz:
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1 Thanks to:
2
3 - Daniel Gerzo for his original BruteForceBlocker
4
5 - Anton Valqk for adding the pf support
6
7 - Lester Hightower for subnet support in whitelists