Ripple can issue/create value in the ripple network.
Mastercoin protocol facilitates the creation and trading of smart properties and user currencies as well as other types of smart contracts.
Namecoin can also acts as an alternative, decentralized DNS.
Sidechain technology with two way pegging proposes a threat to existence of all altcoins.
How exactly does Ethereum show its uniqueness in this competing atmosphere for decentralization,apart from being a new programming platform on which anybody could work anything using Blockchain technology?