It seems legit it was started by the team who created steem monsters you can find more on it here

https://steemit.com/steemengine/@aggroed/introducing-steem-engine-com
https://steemit.com/steem-engine/@abh12345/i-created-a-token-on-steem-engine-com
https://steemit.com/steemengine/@aggroed/vision-for-steem-engine-com-and-some-legal-challenges-along-the-way-for-tokens

So the aim is to be able to create tokens on the steem blockchain just like ERC-20 tokens on Etheruem. They will be building a DEX (decentralised exchange) to allow users to trade tokens.

The smart contracts will also open up a range of new uses and dapps can integrate with one another seamlessly

Hopefully it all works out