There is a list of online resources at the  South Riding Folk Arts Network  website:  http://www.folk-network.com/directory/links.html

It includes most of those that I use. There are certainly many more that I haven't checked out properly yet or don't know about, and I haven't included some others because they are either too unreliable, or too badly designed, to visit except as a last resort.

Garry Gillard's site is now back with him, at  http://www.garrygillard.net/folk/.  Reinhard Zierke had taken it over, but gave it up last year; his own site has disappeared.

Apologies for not yet having replied to your pm, Daniel. This is a start, anyway.