RNtrack is a mail tracker/router for FidoNet-like networks. It's purpose is to process netmail on netmail hubs, though it can be useful for an ordinary node. It takes a letter, compares it with a mask and, if comparison was successful, it executes the corresponding operation with this letter. It works with popular message bases, MSG, PKT, Squish, and JAM.
CrashMail II is a Fidonet tosser/scanner with a built-in AreaFix implementation, support for Binkley style outbound (BSO), and message filtering capabilities. It is a fork of Johan Billing's original CrashMail II distribution that introduces a number of fixes (primarily support for running under 64-bit Linux) and a few new features.