Java

• Squill https://squill.dev.java.net/
• Quaere http://quaere.codehaus.org/
• JDOQL Kodo, IntelliBO, JPox
• JPAQL
• HibernateQL http://www.hibernate.org/hib_docs/reference/en/html/queryhql.html

Ruby

• SQLDSL http://sqldsl.rubyforge.org/
• Sequel http://sequel.rubyforge.org/

C#

• LINQ http://msdn2.microsoft.com/en-us/netframework/aa904594.aspx