Ethereum is described as 'Decentralized platform that runs smart contracts: applications that run exactly as programmed without any possibility of downtime, censorship, fraud or third party interference' and is a very popular cryptocurrency coin in the bitcoin & cryptocurrency category. There are more than 50 alternatives to Ethereum for a variety of platforms, including Web-based, Linux, Mac, Windows and Android apps. The best Ethereum alternative is Bitcoin, which is both free and Open Source. Other great apps like Ethereum are Litecoin, Cardano, TON and Tron (TRX).