Have I missed any? Please let me know. I'll add that in the list...
I did not even know that BTC HODLers got so many Crypto for free!
BTC holders gets it when BTC gets forked,
But there are wallets that doesn't support it so even if you have BTC when the fork happens you wouldn't get your forked tokens or coin.
So far there are so many BTC forked crypto that are listed on the top 100 crypto but the most promising one is the BCH which is currently the top 4 and BSV which is top 6.