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, Alephium and TON.
CureCoin is based on real-world scientific work-contribution, verified and tokenized. As such, to some it's value far surpasses the many seemingly-random cryptocoins which appear to have no other purpose than to be traded (with varying degrees of confidence in their systems).
Ethereum seems closest in concept to CureCoin in that it actually serves a purpose other that simply existing as a(nother) cryptocurrency.