Just to clarify, TOAD is licensed software that you would need to purchase, but as I understand there is an angreement in place where Toadsoft always have to provide a free version. This is the one you'd be looking for.
Depending on you requirements, any free database client may be sufficient. I tend to default to SquirrelSQL, it's written in
Java and and makes
JDBC connections to the database, so it's also handy for
testing connections external to code.