Typesetting UML class diagrams

• MetaUML is a MetaPost library for typesetting UML diagrams with a human-friendly textual notation. Another useful package is emp. It allows to embed Metapost code and therefore MetaUML inside a LaTeX document
• pst-uml is a PSTricks package providing support for drawing UML diagrams.
• uml is another package using PSTricks implementing at least a subset
• pgf/TikZ is so feature rich that it can be used for typesetting UML diagrams as well
• tikz-uml is a UML-specialized TikZ package

For UML class diagrams I'd recommend pgf-umlcd, for sequence diagrams pgf-umlsd (example by the author). Both packages are based on the PGF package collection, which I find very easy to use for drawing vector graphics within TeX & LaTeX.

A nice package I found a while ago is this: TikZ-UML.

It provides:

• Class diagrams.
• Use cases.
• State-transitions.
• Sequence diagrams.

It works pretty well, at least with the sequence diagrams I used.