dbtroff uses XSLT, Heirloom troff, and Ghostscript to convert DocBook documents to PDF or PostScript. It allows you to flexibly customize the layout of the generated output by using troff instructions, and provides automatic page element positioning to avoid typographical artifacts like “widows”. Full-width and inline pictures can be included, and are also automatically positioned. Currently, only a rather restricted subset of DocBook 4.3 is supported.
BOUML is a UML 2 tool box that allows you to specify and generate code in C++, Java, IDL, and PHP. BOUML is very fast and doesn't require much memory to manage several thousands of classes. BOUML is extensible, and the external tools (named plug-outs) can be written in C++ or Java, using BOUML for their definition as any other program. UML models can be exported to HTML pages, including PNG or SVG graphics.
xhtml2pdf converts HTML/XHTML/XHML to PDF using the ReportLab Toolkit, the HTML5lib, and pyPdf. It supports HTML 5 and CSS 2.1 (and some of CSS 3). The main benefit of this tool that a user with Web skills like HTML and CSS is able to generate PDF templates very quickly without learning new technologies.
Kiwi is yet another text to HTML processor which was designed for writing small and medium technical documents and notes. Its markup is very close to the Markdown markup, but Kiwi allows more flexibility in the presentation of your documents. Kiwi is good for writing technical documents, taking notes, or as an engine to be embedded in your application. It has rather complete API documentation.
Trace Modeler is an easy-to-use and smart editor for UML sequence diagrams. It can be used to document existing systems or brainstorm new designs. It instantly updates the diagram layout, freeing you to focus on the interaction content. Trace Modeler lets you be more productive and ensures your diagrams are visually pleasing and structurally correct.