Are you irritated by using command line to manage MongoDB, there is FREE tool named Robomongo.
You can download executable for windows and Mac from http://www.robomongo.org/ for free. According to the site, Linux version is coming.
From the left hand , you have the option of navigating to databases and collection.
Also, you can run the mongodb queries and retrieve the relevant data.
Apart from these option followings are the options you have. So , you can duplicate collection and manage Indexes and manage shards.