didentd is a modular RfC1423 (identd) server for FreeBSD and Linux written with security in mind.
a simple dummy ident daemon written in perl. It is designed to be secure and to give out no useful information
Fake Identd is a tool that replies with a standard answer to all incoming identd requests on a host, making it nearly perfect for a masquerading router.
a simple and secure GPLed ident (RFC1413) server. It requires either inetd, xinetd or ucspi-tcp to run. Basic features
lidentd is a small ident daemon for paranoid people.
linux-identd is a user identification daemon for Linux, which implements the Identification Protocol (RFC1413). This protocol is used to identify active TCP connections.
midentd is a identd server (for linux) designed to allow masqueraded requests to create correct answers. Installing it on the router alone will allow most windows irc clients to work, if you want it to work on a linux client, you have to install midentd on it as well. Apart from simple masqueraded connection it also correctly understands transparent proxies (tircproxy, squid, sendmail) and can optionally return randomly faked replies.
minidentd is a small identd daemon, implementing RFC 1413. It's designed to be small, yet has some cool features like user-configurable responses to requests.
nidentd is a simple identd written in perl, with support for masqueraded connections (using iptables). It does a reverse lookup on the masqueraded host, and uses the first part of the hostname as the ident reply.
Oidentd is an ident (rfc1413) daemon for Linux. Oidentd supports most features of pidentd as well as a number of features absent in pidentd.
Pidentd v3 is a much improved version of the original Ident daemon both in terms of speed, code quality and features. Features include multithreading, a "configure" script, startup autodetection, much clearer/rewritten C code, doesn't run as root after startup, has a configuration file and can be started from /etc/inittab (on systems using a SysV init).
Peter's Ident Masquerading Program Daemon is an RFC1413 compliant identd server with masqueraded connections support, designed to be executed from inetd.
This server application is meant for the totally paranoid that need access to servers that require ident and don't want to give any information about local users to the remote server or its other users.
slidentd is a secure, lightweight ident daemon for Linux.