Umple can be used for pure UML modeling. Or it can be used to add UML constructs, such as associations and state machines to code written in Java, PHP, or Ruby. It generates code in these languages that can save a large amount of programming effort and result in higher quality. The UmpleOnline tool allows you to edit UML diagrams graphically, and watch the Umple textual code being written in real time. This works the other way too: you can write textual Umple and watch the corresponding UML diagram appear. Umple is being extended to support patterns, tracing, and a variety of other features. Umple is written in itself, which is central to maintaining its quality. Umple can be used today by any programmer or modeler.
The JAB Workbench Freeware Libraries include the JAB Recipe Library, which contains numerous GUI Widgets and a framework for connecting to a SQLite database using a Java applet. Many example projects are provided, divided into various packages, including GUI Examples, Database Access Examples, and Advanced Examples.
openTCS is a platform-independent transportation control system (TCS) intended to control automatic guided vehicles (AGVs), but which can be used to steer virtually any (track-guided) vehicle. It consists of an abstract kernel which implements replaceable algorithms and strategies (computation of routes, dispatching of orders to vehicles, scheduling of resources, etc.), pluggable vehicle drivers which implement communication protocols, and a graphical frontend for creating and visualizing logical models of areas the vehicles are moving in.
Mbassador is a very lightweight message (event) bus implementation following the publish-subscribe pattern. It is designed for ease of use and aims to be feature rich and extensible while preserving resource efficiency and performance. It offers annotation-driven configuration (and thus imposes no structural dependencies into client code), synchronous and asynchronous message delivery (configurable for each message publication and listener), weak references to registered subscribers (no memory leaks possible), message filtering based on custom filters configured via annotations, clean error handling mechanisms, very high throughput, and strong support of concurrent access.