It’s free and it works great for querying your NOSQL databases.
I am using it here against a free instance of MongoDB database hosted on MongoLab. It works great and fast and is nice for people who have been using TOAD against Oracle for years.
It also works Cassandra and Hadoop amongst others. For free, give it a try. There’s also an Eclipse plug-in, but that was a little too slow and memory draining for me. They use a funky datahub for querying things and that seems to work well for me on Windows 7.