Many people have asked me about software that supports GML 3.2. This version of GML is pretty new, but it’s probably the most important version of GML since it’s the one that has become the ISO standard for geographic encoding in XML. Recently I got at email from the folks at The Carbon Project, announcing GML 3.2 support in their free geographic data viewer, Gaia 3.3. Check it out. Lots of documentation, even in video format. Gaia is slick, stable and has a ton of features built on OGC standards.