CoinPrism
Counterparty
Nxt	Open Transactions
(beta)	(beta)
Sold out to evil statists and financial cronies. Fuck 'em.
Bitcoin colored coin
Bitcoin blockchain + Embedded Consensus System
Proprietary blockchain and protocols

Articles:

Color Coin Basics: Making Sense of Colored Coins

Product Review: Features Comparison Table

Go to Hogeye Bill's Libertarian Page.