Features From the Most Popular Altcoins Are Planned for BitcoinFor many people involved with Bitcoin, altcoins are nothing more than testnets. Hundreds of digital currencies are currently listed on CoinCap.io, but Bitcoin still dominates 78 percent of the market. In total, there are only 10 digital currencies with a current market cap of $10 million or more.
https://bitcoinmagazine.com/articles/features-from-the-most-popular-altcoins-are-planned-for-bitcoin-1463675591Litecoin is the third biggest
(Ripple doesn't count)
