If you are developing with Hibernate, chances are you may have come across the (now replaced) Hibern8IDE, or more recently the JBoss Hibernate Tools plugin for Eclipse which allows you to test HQL queries against your defined objects and mappings.
The Hibernate Tools Suite looks like a similar type tool, but this is a plugin for Netbeans. Looks like it is worth checking out if you are working with Hibernate and developing with Netbeans.