HubSpot finally made their New Design Manager public. We've actually been using it for awhile now while it was still in closed beta. We've built a few sites now using it and have learned a lot of best practices and new ways of doing things.
HubSpot power users like us are always hungry for more features. Recently our team implemented some advanced coding for the most challenging tasks - an external administrative interfaces and AJAX support.
Spin Group has developed a set of advanced tools to help with HubSpot website migrations, including a blog importer, topics management, and redirect management.