ezSQL is an open source PHP database class that I wrote a while back. It’s used on over 100k websites and is the backbone of many open source projects such as WordPress. The class makes it ridiculously easy to use mySQL, Oracle8, SQLite (PHP), within your PHP script.
Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process engine for Java. It's open-source and distributed under the Apache license. Activiti runs in any Java application, on a server, on a cluster or in the cloud. It integrates perfectly with Spring, it is extremely lightweight and based on simple concepts.
Bonita is an Open Source Business Process Management (BPM) software and Workflow software edited by the BPM company BonitaSoft. Develop process based applications easily with Bonita Open Solution.
Naturally I want to have a transactional DBMS, so I always pick InnoDB as the MySQL storage engine. I also want UTF-8 support because the content I store is entered by users from all over the world. Hence not all of the tips and tricks shown here might be relevant for you, in fact, if you are happy with your system in production, do not change anything. Also note that many of these customizations are only relevant if you let Hibernate generate your MySQL DDL and schema for you.