Anoncoin is currently the only cryptocoin that supports the i2p darknet.
The goal of BTE is to make a Bitcoin clone 1:1 copy. Giving people a real option to the rising difficulties of other coins while maintaining all the things that made Bitcoin so successful
Devcoin is an ethically inspired cryptocurrency created in 2011 to support open source projects by programmers, hardware developers, writers, musicians, painters, graphic artists and filmmakers worldwide. Merge-mined with Bitcoin.
Official digitalcoin Community, an alternative cryptocurrency
dogecoin is an open source peer-to-peer cryptocurrency
An interesting variation on a cryptocurrency, payouts are based on the time of year and vary based on the earth's rotation (or something).
Feathercoin alternative cryptocurrency
Freicoin is a peer-to-peer (P2P) currency based on the accounting concept of a proof-of-work block chain used by Satoshi Nakamoto in the creation of Bitcoin. Unlike Bitcoin, Freicoin has a demurrage fee that ensures its circulation and bearers of the currency pay this fee automatically.
GoldCoin is designed to be the gold standard of digital currency, for this reason it is faster than both BTC and LTC in terms of confirmation times
Infinitecoin alternative cryptocurrency
The Internet eXchange Coin (IXC) first Mined on April 2011
Megacoin alternative cryptocurrency
Novacoin is a hybrid scrypt Proof-of-Work + Proof-of-Stake based cryptocurrency operating with no central authority via peer-to-peer open source network. It has no hard cap except for the 2 billion coin max that has been entered for coding purposes; this can be lifted in the future if needed.
Nextcoin alternative currency
Alternative currency using a novel proof-of-work and proof-of-stake hybrid algorithm that aims to be more energy efficient than other crypto currencies.
Primecoin is the first scientific computing cryptocurrency, a project derived from Bitcoin but with novel non-hashcash proof-of-work that mines prime numbers.
ProtoShares is a class of crypto-currency that let you capture a position in one or more cool new DACs before it
they are ever implemented.
Quark is a crypto-currency that allows online coin transactions. Quark uses nine rounds of secure hashing from six different algorithms to encode Quark transactions securely.
Peer to peer decentralized digital currency with no central authority, no chargeback and low transaction fees.
WorldCoin's features are 60 second confirmations, and a 265 million coin cap
Generate secure offline paper wallets for WDC (WorldCoin)
WorldCoin Block Explorer
Explore the WorldCoin Blockchain
Zetacoin is an open source crypto-currency based on the Bitcoin protocol. It features fast transaction times and fast difficulty adjustments. Initial coin mining is 160 million coins, thereafter a yearly inflation of 1 million coins.