KwikUML

KwikUML is, as its name suggests, a tool to quickly build UML models of ActionScript and PHP classes and interfaces, as well as, SQL Entity Relationship Designs (ERDs).

Built on Adobe's AIR runtime, this desktop application allows you to not only build those models but export PNGs of the models for use in specification documentation and generate stub code from the models to use as a starting point once it's time to actually begin development.