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RSK [0] is already in beta and EOS [1] will launch a dev testnet in Q3-Q4 IIRC. RSK uses the ethereum VM so the smart contracts and dApps will be compatible/portable.

[0] http://www.rsk.co/

[1] https://eos.io/

Not out yet, but Filecoin: https://filecoin.io/. It's like Ethereum but with file storage capabilities + built-in bridges to other cryptocurrencies.

Filecoin doesn't have any smart contracts as far as I'm aware, so it's limited to use as a decentralized storage network. I believe it would be possible to build something very similar to Filecoin on the Ethereum platform. Storj (https://storj.io/) may be trying to do that.

Edit: Filecoin does mention smart contracts in its white paper.

EOS is the likely successor in my opinion.

(eos.io)

In development now, but a development environment will be up and running by the end of the summer; testnet coming in the fall. Full release next summer.

https://www.shiftnrg.org/

Yeah sure, check this version of the lottery https://github.com/renasboy/ETHLottery