Radiuslib is a complete RADIUS protocol and utility library for the Ruby programming language. It includes a very featureful, RFC- compliant protocol implementation, as well as parser classes for RADIUS dictionaries, Cistron-format "users" files, and standard "detail" accounting logs.
ReferrerCop parses Apache log files and AWStats data files and removes entries for referring URLs that match a list of known referrer spammers. Logs can be run through ReferrerCop either before or after they're processed by AWStats (or before they're processed by any other log analyzer) to eliminate annoying referrer spam from Web statistics.
Ruby Nmap::Parser Library provides a Ruby interface to Nmap's scan data. It can run Nmap and parse its XML output directly from the scan, parse a file containing the XML data from a separate scan, parse a String of XML data from a scan, or parse XML data from an object via its read() method. This information is presented in an easy-to-use and intuitive fashion for storage and manipulation.