I have been working on a simple site where one can view available altcoin balance on any Bitcoin address. It only works for Bitcoin Gold and Cash right now but I intend to extend on that.
I've also compiled a list of over 20 altcoins that gives some sort of dividends to Bitcoin owners, either via airdrops or chain forks.
I hope it can be of some use:
http://btcdiv.com
You made an awesome list and I bookmarked your site. Thank you for your great service with so much useful informations. I know, that it is awful much work, but I would be glad, if you could extend your list to all upcoming Bitcoin forks. Do you know already something about Bitcoin Diamond? I've also compiled a list of over 20 altcoins that gives some sort of dividends to Bitcoin owners, either via airdrops or chain forks.
I hope it can be of some use:
http://btcdiv.com