Adopting XML: Tomorrow's Web

Editors [3]: The big SGML toolsets

There are good, established SGML tools, but these may be too expensive or too technically demanding (or both) for most Web production houses.
Most of these tools are targetted twowards the management of large, complex documents (which makes sense for XML) but will look strange to people use to HTML editing tools.
Interleaf

Now being branded as an XML content tool, Interleaf is a long established suite of SGML tools including WYSIWYG editors and content management tools. Cost: unstated but high.
FrameMaker+SGML

Now owned by Adobe, FrameMaker+SGML is an advanced Desktop Publishing package which understands SGML and has user-oriented facilities for managing stylesheets and DTDs. Cost: about $2000 per seat.
Arbortext

Originally coming from the technical documentation market, Arbortext is another serious publishing toolset now being retargeted at the XML market. The toolkit includes a wide range of input filters, and has a module which links into Microsoft Word, as well as it's own end-user oriented editor.

Cost: about $2,000 per seat, DTD compiler is more.

A number of other SGML editing tools can also be used for XML.