A realtime, distributed, fault-tolerant stream processing engine from Twitter

restSQL is an ultra-lightweight data access layer for HTTP clients. restSQL is a persistence framework or engine in the middle tier of a classic three tier architecture: client, application server and database. It may also be embedded in any middle-tier as a Java library.

...an Open Source (Apache 2), Distributed, RESTful, Search Engine built on top of Lucene.

Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).

Openfire is a real time collaboration (RTC) server licensed under the Open Source GPL. It uses the only widely adopted open protocol for instant messaging, XMPP (also called Jabber). Openfire is incredibly easy to setup and administer, but offers rock-solid security and performance.

Survey on unit-testing and test-driven development.

minimum-usable complexity: another +1 for python over java ;)

Very nice essay about simple vs. complex software architectures and real world's needs vs. big companies imaginations...