For older dances, The Round has the five Cecil Sharp books that are out of copyright online: https://round.soc.srcf.net/dances/cdb (it's easiest to search for dances using the cumulative index link).
And Bob Green has been working on a video archive of dances, which is an excellent resource: http://dancevideos.childgrove.org/ecd
There used to be a website that had animated versions of the various moves, but it seems to have disappeared. Settling for written definitions, The Round has a list of more figures than we are likely to ever use: https://round.soc.srcf.net/dances/elements
Once again, you may notice that we use two resources a lot: Simple Pleasures and 21 Easy English Country Dances. Those were the two I recommended in my blog for starting one's dance collection
Updated Forms page to include a resources section. I never was happy with that page. I think it looks better now.