afinger is a configurable finger client, written in Perl. It can be used both together with a finger daemon and from the command line. afinger honours a .nofinger file in home directories, you can set a minimum and maximum UID, use a Fortune program for erroneous requests, and virtually control each part of the returned information.
This is a much updated version of Mike Shanzer's fingerd-1.3. It is almost completely rewritten, well-debugged (i.e., more secure), and quite configurable. It supports ACLs, a message-of-the-day file, the ability to run programs for given user-IDs, and a full set of command-line options that make it mostly compatible with modern BSD versions. It is portable, uses GNU Autoconf and GNU Automake for builds, and it comes with a ready-to-use BSD makefile too.
PFinger is a highly configurable, secure and portable finger deamon. It is started by inetd but does not run as root. The service may be disabled for individual users by the administrator or by the users themselves. It offers configurable special files (e.g. a users PGP-Key could be retrieved with 'finger john.pgpkey@host), no printing of users home directory or shell and it also provides a graphical frontend that allows users to easily alter the output that will be sent, when they are fingerd.
XMail is an Internet and intranet mail server featuring an ESMTP server, POP3 server, finger server, TLS support for SMTP and POP3 (both server and client side), multiple domains, no need for users to have a real system account, SMTP relay checking, DNS based maps check, custom (IP based and address based) spam protection, SMTP authentication (PLAIN LOGIN CRAM-MD5 POP3-before-SMTP and custom), a POP3 account synchronizer with external POP3 accounts, account aliases, domain aliases, custom mail processing, direct mail files delivery, custom mail filters, mailing lists, remote administration, custom mail exchangers, logging, and multi-platform code.