Neo, Eos and Cardano are Blockcain Open Source technology platforms that prevent developers from executing smart contracts and creating decentralized applications. They have a number of differences, form market capitalisations to the consensus mechanism. NEO, uses consensus mechanism calls Delegation of delegated Byzantine tolerance. This system uses community-elected delegates who speak for a group of Neo users. Eos uses a very similar consensus mechanism, calls for delegated participation and uses a voting mechanism. Cardano uses a slightly different face-off mechanism