Combining a modified Bitcoin Core infrastructure with an intercompatible version of the Ethereum Virtual Machine (EVM), Qtum merges the reliability of Bitcoin’s unfailing blockchain with the endless possibilities provided by smart contracts.
Bitcoin Gold is a new fork of Bitcoin. To claim you have to import private keys to a Bitcoin Gold wallet. Beware of scam wallets. Importing a private key to a scam wallet, you can lose your BTC and BTG too. It is safe to move your Bitcoins to another wallet with different Bitcoin addresses, so in case of a scam wallet, the corresponding Bitcoin address has zero Bitcoins.