The CLAM currency is also known as clam coin. It claims to be the cryptocurrency that is distributed among holders in the fairest-possible way. Clams are dug up, and there is a chance you might already have some. This could be possible if you have a BTC wallet, or LTC or DOGE address and you had a balance there on May 12th 2014.
As with other cryptocurrencies, it stems from computers that run software relating to the currency. CLAMs works by using the original open-source software that was used to create Bitcoin. Hence, many others have now been developed, one of which is CLAM.