This is not yet complete, but a list of some credits and attributions:

Uses: Apache Tomcat, it's great.

Uses: Postgres, the most user friendly enterprise database.

Uses: Apache Mina, use Java NIO without turning grey.

Uses: JQuery, makes Javascript usable. Even fun.

Uses: Mozilla Rhino, Stevey said it's cool.

Optionally runs on: Terracotta, awesome Java clustering (with annoying licensing so we can't distribute any part of it).

Includes some: Silk Icons