SquidGuard is a URL redirector used to use blacklists with the proxysoftware Squid. There are two big advantages to squidguard: it is fast and it is free.
HyperMail
Hypermail is a program that takes a file of mail messages in UNIX mailbox format and generates a set of cross-referenced HTML documents. Each file that is created represents a separate message in the mail archive and contains links to other articles, so that the entire archive can be browsed in a number of ways by following links. Archives generated by Hypermail can be incrementally updated, and Hypermail is set by default to only update archives when changes are detected.