Simple simeng (simple simulation engine) is a bare bones Java-based discrete simulation engine that uses variable time steps. Events are inserted in an ordered queue, and time is advanced based on the time the next event needs to be executed instead of discrete predefined timesteps. Entities can send events directly to other entities (one-2-one), or events can be broadcast to subscribed entities (one-2-many). The simplicity of the engine makes it suitable for educational purposes.
skipfish is a high-performance, easy, and sophisticated Web application security testing tool. It features a single-threaded multiplexing HTTP stack, heuristic detection of obscure Web frameworks, and advanced, differential security checks capable of detecting blind injection vulnerabilities, stored XSS, and so forth.
Social ray is a platform for professional networking. Its collaboration features include friends and communities, mailboxes, instant messaging (using AJAX), a powerful search engine, document sharing, forums, vanity URLs for users, and rich media support. Its professional networking features include resume uploads, job searching, automatic job matching, testimonials, the ability to post jobs, job referrals, and accounts for recruitment consultants.
Spring is a lightweight Java/J2EE application framework based on code published in "Expert One-on-One J2EE Design and Development" by Rod Johnson. It includes powerful JavaBeans-based configuration management applying Inversion-of-Control principles, a generic abstraction layer for transaction management allowing for pluggable transaction managers, a JDBC abstraction layer, integration with Hibernate, JDO, Apache OJB, and iBATIS SQL Maps, AOP functionality, and a flexible MVC Web application framework with multiple view technologies. There is also a .NET port available.