The DBacesslayer (or DBSlayer for short) is a lightweight database abstraction layer suitable for high-load Web sites where you need the scalable advantages of connection pooling. DBSlayer talks to clients via JSON over HTTP, meaning it's simple to monitor and can swiftly interoperate with any Web framework you choose.
OpenJPA is a 100% compliant feature-rich implementation of the persistence part of Enterprise Java Beans 3.0, also known as the Java Persistence API (JPA). It can be used as a stand-alone POJO persistence layer, or it can be integrated into any EJB3.0 compliant container and many lightweight frameworks.
WSO2 WSAS is an integrated Web services platform which offers a complete middleware solution. It is a lightweight, high performing platform for Service Oriented Architectures, enabling business logic and applications. Bringing together a number of Apache Web services projects, WSO2 WSAS provides a secure, transactional, and reliable runtime for deploying and managing Web services. It features data services support, Eclipse IDE integration, clustering support, full support for WS-Security, WS-Trust, WS-Policy, and WS-Secure Conversation and XKMS, and EJB service provider support.
TiTLi is a Google-like search tool for relational databases . It builds on top of Apache Lucene to provide an API and a GWT-based UI for searching multiple databases from various vendors simultaneously. It is very fast due to indexing, and the database is queried only when a record is chosen.