Question: What are the query browsers for DB2 e.g Database Administrator(Data Studio), Toad for DB2 etc? I worked with them but are there more ?

Answer: 
I find [DbVisualizer](http://www.dbvis.com/) to be outstanding even when compared to many native tools.

![DbVisualizer Features](https://i.stack.imgur.com/nK5Be.png)
I recommend the IBM data studio among the free tools. It lets you

* Manipulate(Create , modify, execute) stored procedures
* See explain plans - run performance analysis
* Let you open unlimited connections which some of the free tools doesn't let you.

Also, it's based on eclipse framework, so if you are already using eclipse its almost a breeze to learn. Toad freeware is also cool, however the freeware has a licensing limitation of max 5 per enterprise.

Also, check the [latest IBM data studio download](http://www.ibm.com/developerworks/downloads/im/data/)