DRBGuestbook is a simple PHP guestbook script that uses a flat file and does not require any additional database software. It supports an easy-to-use, Web-based administration interface. Features include flood protection, banning by IP address, a bad words list, email notifications, and multiple anti-spam features.
OpMon is a network and system monitoring application based on Nagios with extended support for capacity planning, SLA, SLM, network discovery, service catalogs, report schedule, Davinci, a dashboard builder, and much more. OpMon provides a GUI for Nagios as well as full multi-language support. The license to use the opmon proprietary modules is free for 2 hosts and 20 services. OpMon comes with many open source applications like phplogcon, Nedi, ntop, nagtrap, OCSInventory, OTRS, and opcfg.