there is a comparison of blockchains on Icon website. lots of other platforms are including Neo, Strat , Ardr, Ark ,Qtum ,Bts, Texos ,Lisk ,Rise ,Waves ,Bos ,Iota, etc...
Blockchain Connecting projects such as Cosmos ,wanchain ,chain link etc..
which are real competitors? will Icon be Korea's Ether
NEo is China's Ether and I believe that ICON would be the next world's Ether!!