JRequisite is an agile requirement management tool, which means your requirements are defined mainly via visual tools as opposed to textual requirement tools. Also, it is independent of the process used, so you may apply any process to your development. Despite being a requirement analysis and management tool, JRequisite tools are so general that they can be used in other areas of software development and even non-software related fields.
OmegaT is a translation memory application intended for professional translators. It does not translate for you (software that does this is called "machine translation"). It features fuzzy matching, match propagation, simultaneous processing of multiple-file projects, simultaneous use of multiple translation memories, and external glossaries. Document file formats include plain text, HTML, and OpenOffice.org/StarOffice. It has Unicode (UTF-8) support (can be used with non-Latin alphabets). It is compatible with other translation memory applications (TMX Level 1).
JCite makes it possible to cite snippets of Java source code in your HTML documents (API documentation, for instance). The snippets are copied out of Java class source files, which should be part of the regular build. This guarantees that the cited snippets are always up-to-date. If you cite from unit tests, you even get the guarantee that they still work correctly. Finally, thanks to the excellent Java2Html library, the cited snippets get automatic syntax highlighting.
Rextile allows you to build XHTML documents and entire Web sites with ease. You write text using Textile (a format much more concise than XHTML), automate document parts with Ruby scripting, and generate the site offline (the server gets static XHTML). Rextile was inspired by Xilize. It uses RedCloth to convert Textile to XHTML, erb to run script blocks, and Hpricot for DOM manipulation.