You can try Coinomi, it's open source wallet which supports all coins that you need, except DGC. But it only works on Android devices.
There are some more multi coin wallet like Jaxx, Exodus, Holytransaction and others. But they don't support DGC.
You can use exchange, but it's not safest place to keep coins.
I didn't know what DGC was before reading this post just minutes ago:
Is there a web wallet supporting dgb? Please advise. Thanks in advance
Coinami supports Digitbyte as well as Bitcoin, Litecoin, ETH and many Alts
Dgb is on a downward trend. I would strongly advice to stay away for the time being. Never try to catch a faling knife, it will cut you. Don't be a bagholder. Stay away from Digibyte for the time being.
But it seems that they do support this coin.