DatabaseToUML reverse engineers a database schema from an existing relational JDBC database. Tables and fields are reversed to classes and attributes, constraints are reversed to association, and tables composed only of foreign keys are converted to many-to-many associations. The main idea is to reuse the reversed model in a generator, taking UML2.x (EMF XMI 2.0/2.1) models as input.
AgileJ StructureViews is an Eclipse plugin that generates highly configurable reverse engineered class diagrams for Java programmers. It specializes in supporting agile project development through the automated production of high presentation quality class diagrams with project-specific content generated and regenerated with minimal user effort.
6jack is a framework for testing, analyzing, and fuzzing network applications. 6jack runs a command, intercepts calls to common network-related system calls, and passes them through an external filter. A filter can be written in any language supporting the MessagePack serialization library. 6jack is especially useful for writing tests for clients and servers, debugging and reverse engineering protocols, sketching filtering proxies, and fuzzing.