AFT (Almost Free Text) is a document preparation system. It is mostly free form, meaning that there is little intrusive markup; AFT source documents look a lot like plain old ASCII text. It has a few rules for structuring your document, more to do with formatting your text than embedding lots of commands, and it produces all types of output (HTML, XHTML, LaTeX, roll-your-own XML, etc.). All that needs to be done is to edit a rule file. You can even customize your own rule files for specialized output.
Elvis is a clone of vi/ex, the standard UNIX editor. Elvis supports nearly all of the vi/ex commands, in both visual mode and ex mode. Elvis adds support for multiple files, multiple windows, a variety of display modes including "hex" and "html", on-line help, WYSIWYG printing, and other miscellaneous extensions.
HTML::EP is a server-side embedded HTML system in the style of PHP3, that allows you to combine the full power of Perl with your HTML pages. HTML::EP runs as a separate CGI binary or (for full speed) as a mod_perl package. It includes database access via DBI, the Perl Database Interface, session support and allows quite easy extension via a modular, OO interface.
The iPerl interpreter is a transforming filter that works much like the C preprocessor or the m4 macro processor, only that the language embedded into a document is full powered Perl. iPerl documents consist of any kind of text to be output, and bits of specially-marked Perl that control the document with conditionals or loops spanning text, subdocument-includes, and macro definitions. This is comparable to but far more powerful than the C preprocessor or the m4 macro processor. It can also be seen as a template-mechanism.
WEEDS is a Java 1.1 application which converts XML files describing written to "limon.dtd" to an HTML-formatted flora. We wrote weeds to make our own flora of 32 plants we observed in the Dominican Republic, but we believe WEEDS would be immediately useful for anyone who wants to make a flora. Also, the design and much of the code could be adapted to many other applications such as online catalogs.