Aephea is a text-based authoring tool for HTML. It enforces well-formedness with a simpler and stricter TeX-like syntax and provides useful extensions and abstractions with facilities for adding new ones. It emphasizes a single unified approach that stays close to HTML itself and promotes and utilizes CSS extensively. Abstractions such as dictionary stacks, arithmetic, and iteration are part of Aephea.
yodl implements a pre-document language and tools to process it. It lets you write a single document, then use a tool (e.g., yodl2html) to convert it to some final document language (HTML, man, LaTeX, etc.). Yodl's document language is easy to use and to expand. Predefined converters are available from Yodl to HTML, LaTeX, groff (manpages), text, and (experimentally) XML, but new converters can be added easily.
OOoPy is a Python library for modifying OpenOffice.org documents. It provides a set of transformations on the OOo XML format using the ElementTree XML Library. Transformations included are a mail merge application and the concatenation of documents with formatting intact. The framework supports easy creation of new transformations.
The Heirloom Documentation Tools provide troff, nroff, and related utilities to format manual pages and other documents for output on terminals and printers. They are portable and enhanced versions of the respective OpenSolaris utilities, which descend from ditroff and the historical Unix troff. troff provides advanced typographical features such as kerning, tracking, and hanging characters. It can access PostScript Type 1, OpenType, and TrueType fonts directly. Internationalized hyphenation, international paper sizes, and UTF-8 input are supported.
SiSU (Structured information, Serialized Units) is a lightweight markup based, text structuring and publishing framework (that features granular search). With minimal markup of a plaintext file, it produces: plain-text, HTML, XHTML, XML, ODF, LaTeX, PDF, and populates an SQL database at an object/paragraph level for granular searches. Prepare documents using your text editor of choice, then use SiSU to generate the desired output formats. SiSU is controlled from the command line.
uni2ascii and ascii2uni provide conversion in both directions between UTF-8 Unicode and more than thirty 7-bit ASCII equivalents, including RFC 2396 URI format and RFC 2045 Quoted Printable format, the representations used in HTML, SGML, XML, OOXML, the Unicode standard, Rich Text Format, POSIX portable charmaps, POSIX locale specifications, and Apache log files. It can also convert between the escapes used for Unicode in languages such as Ada, C, Common Lisp, Java, Pascal, Perl, Postscript, Python, Scheme, and Tcl.