Roma is an Open Source initiative to make Java application development easy. The approach is totally DDD: let's think to the domain of your application and Roma will make the rest: persistence (database), presentation (HTML + Ajax), logging, user management, sessions, workflow, scheduler, etc....

REST is a fine pattern for designing controllers, but it can be pretty repetitive. Who wants to write out the same actions and copy the same model lookup logic all over their application?

make_resourceful handles all that for you. It sets up all your RESTful actions and responses with next to no code. Everything has full, sensible default functionality....

logstash is a tool for managing events and logs. You can use it to collect logs, parse them, and store them for later use (like, for searching). Speaking of searching, logstash comes with a web interface for searching and drilling into all of your logs.

It is fully free and fully open source. The license is Apache 2.0, meaning you are pretty much free to use it however you want in whatever way....

Oryx is a web-based editor for modeling business processes in various modeling languages like BPMN or EPC. You can create models and share them with your business partners, clients and friends. You may not only share a model with your colleagues, but discuss and improve it within one working environment. Thus, Oryx brings all the advantages of Web 2.0 into the world of modeling. To start modeling you need zero installation–your model is just one click away....

Webrat - Ruby Acceptance Testing for Web applications,

Use instead of fixtures to create valid objects for your Ruby test suite.,

Neo4j is a graph database. It is an embedded, disk-based, fully transactional Java persistence engine that stores data structured in graphs rather than in tables. A graph (mathematical lingo for a network) is a flexible data structure that allows a more agile and rapid style of development....

Apache Synapse is a simple to use, lightweight and high performance Enterprise Service Bus (ESB) from Apache.

It can deal with SOAP 1.1/1.2, REST, POX, Plain Text, Binary, Hessian, FIX and other types of messages over non-blocking http/s, JMS (1.0/1.1), File systems (s/ftp, CIFS, local, tar/zip/gz..), Mail (POP3, IMAP, SMTP), AMQP, TCP/UDP, XMPP and others. It can also deal with initiating/terminating WS-Addressing, WS-Security and WS-Reliable Messaging...

Thrift is a software framework for scalable cross-language services development. It combines a powerful software stack with a code generation engine to build services that work efficiently and seamlessly between C++, C#, Erlang, Java, Haskell, Perl, Python, PHP, Ruby, and Smalltalk....

Shoulda makes it easy to write elegant, understandable, and maintainable tests. Shoulda consists of test macros, assertions, and helpers added on to the Test::Unit framework. It’s fully compatible with your existing tests, and requires no retooling to use....