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worldKit is an easy to use and flexible mapping application for the Web. Light weight GIS. It's a SWF based app, configured by XML, data fed by RSS. Stand-alone use or integration in larger projects. [Simple]
Cadcorp will be releasing a Plug-in, and an updated version of our free Map Browser OGC W*S client that can use it, sometime soon. The Plug-in supports: Simple and GML profiles; point, line and polygon geometries; and the various RSS encodings. [GML, Simple]
ROME is an open source (Apache license) set of Atom/RSS Java utilities that make it easy to work in Java with most syndication formats.
Geonames provides free geo-data such as geographical names and postal codes. The database contains over 6 million entries for geographical names whereof 2.2 million cities and villages. In addition to the raw feed, there's also a worldKit map. [Simple]
The Geograph British Isles project aims to collect a
geographically representative photograph for every square
kilometre of the British Isles. [Simple]
GeoRSS is a normative reference for Technical
Guidance for the Implementation of INSPIRE Download Services for
Atom data set feeds.
Canada identifies GeoRSS as a standard.