Widely known in Europe website management platform acquired by Accel-KKR in 2015 and merged with Ektron. We use Epi’s API to get at most of your structured content but, like Ektron, have a custom web service we use to reach the unstructured stuff.
Of note, Episerver has its own enterprise search called Find. Find is extraordinarily expensive in terms of licensing, development required for it to federate, and hosting. FUSE Search has the same features (and more) but is much more flexible (i.e. plays nicely with others) and cost-effective.