JWhoisServer is a small, fast, and highly configurable RFC 3912 compliant whois server written in Java and using RDBMS as a storage engine. It supports INET lookups (IPv4 and IPv6) and IDN domain names handling).
WeIRCd is a robust, simple, and easy-to-use IRC daemon. Its built-in services make setting up Chanserv, Nickserv, and others very easy. The server supports runtime loaded modules and other modern features.
freedns-afraid is a dynamic DNS client or updater, a Linux daemon which keeps your record on the free dynamic DNS service freedns.afraid.org up-to-date. The rpm is built for Fedora, but it should work for other rpm-based Linux distributions which use systemd and NetworkManager.