Which full node implementation(s) supports SegWit2x? I'm running a full node, because I want to support the Bitcoin network, and because I'm interested in the backend mechanisms in Bitcoin.

Now, SegWit2x is approaching. I believe it's important for Bitcoin to increase the block size, so I would like to somehow support the doubling of the block size. Can I somehow support SegWit2x through my choice of full node software? If I can choose between Bitcoin Core, Bitcoin ABC, Bitcoin XT, and Bitcoin Classic: Are there any feature differences that would make those more or less supportive of the block size doubling?
If I can choose between Bitcoin Core, Bitcoin ABC, Bitcoin XT, and Bitcoin Classic


None of these software support Segwit2x. Currently your only choice of Full node software for Segwit2x is btc1.