db4o is the world's leading open source object database for Java and .NET. Leverage fast native object persistence, ACID transactions, query-by-example, S.O.D.A object query API, automatic class schema evolution, small size (http://developer.db4o.com)
RubyIDE is an opensource Ruby Language IDE for writing and building Ruby Scripts. It makes easy the Ruby Language Development.
CodeBooster is a set of DataTier generating tools written in C# that generates a stack of Data Access layers and objects from the existing schema in a database. Current databases supported are MSSQL, Oracle, and MySql.
Dzine is a case tool for OOAD. Draw use case,interaction,class,deployment,ER Diagrams. Code generation in C++ and java and for SQL. Reverse engg design from code. Just put in your Java or C++ code and generate class diagrams.
aspbeans is a framework allowing translation between bean-like .NET objects and ASP web forms, allowing forms to be mapped to an object-oriented hierarchy (with relationships like many-to-one or one-to-one). Reduces coupling and makes developers happy.