There are many tools and repositories under https://github.com/ewasm
What are the main steps to writing a smart contract in eWASM? What are the main components involved?
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You do not need to write contract in eWASM. Just write it using solidity, and it will be converted to EVM bytecode, then eWASM.
As I know so far, the eWASM is only available on Kovan testnet, so you may need to use parity to test it out if you're interested.