Looks like this thread hasn't had any updates in a while, which is a shame since there are still new campaign settings & mini settings being published, and it's neat to have a single(ish) source to list them.
Would love to hear about some of the newer settings that have come out.
I've recently published Yarthe, which is a gaslamp fantasy/steampunk alternate earth for 1e & 2e.
There's also Koboa (which, to be fair, is still in pre-order but does have a preview version out and available now), which is based on South American mythology and culture.