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Misc Tools  
Blowfish Advanced 97 A conventional encryption program that offers several encryption types, including the Blowfish, PC1, Cobra128 and IDEA (optional) algorithms. The interface is easy to use and thorough. 
dnswalk is a DNS debugger. It performs zone transfers of specified domains, and checks the database in numerous ways for internal consistency, as well as accuracy.
International PGP
PGP 5.0 is the latest international version of PGP. It is basically the same version as PGP 5.0, but because it was compiled from source code that was scanned and OCRed from printed books that were legally exported from the US, it is legal to use in almost any country in the world.
TCP Wrappers
With this package you can monitor and filter incoming requests for the SYSTAT, FINGER, FTP, TELNET, RLOGIN, RSH, EXEC, TFTP, TALK, and other network services. The package provides tiny daemon wrapper programs that can be installed without any changes to existing software or to existing configuration files. The wrappers report the name of the client host and of the requested service; the wrappers do not exchange information with the client or server applications, and impose no overhead on the actual conversation between the client and server applications