The best alternatives to Feng-GUI are UX Check, SiteSesh, and Maptiks. If these 3 options don't work for you, we've listed a few more alternatives below.
Maptiks is an analytics tool designed to track visitors on a web map application. Track visitor interactions in near real-time, and get metrics on the performance of your map to help make better user experience...
Spectre™ ES is a desktop GUI for editing and deleting Documents in an Elasticsearch database. Edit or Remove Documents directly inline. Manage your Elasticsearch Database with an easy to use Kibana alternative.