xindy is an index processor that can be used to generate book-like indexes for arbitrary document-preparation systems. This includes systems such as TeX and LaTeX, the roff-family, and SGML/XML-based systems (e.g., HTML).
Man2docbook is a platform neutral application used for translating man pages to DocBook XML/SGML. This application is implemented as a simple filter. Troff equ and tbl are supported in docbook output file and preserved for docbook->man re-generation.