The Entity Admin Handlers module provides an out-of-the box admin UI for custom entity types whose configuration means that the admin UI code in Drupal core doesn't fit.
Did you ever have to profile your pages to find how those can be optimised? Did you ever have to profile that particular ajax request made by JS app, trying to find it among the logs on a site that is used by many people at the same time? Did you ever struggled to check requests to 3rd party service during that particular ajax request? If you did, but always wanted to have ALL that info conveniently displayed to you on the SAME page you are currently viewing and in real time, grouped by each request/ajax call - then this module may be just the thing you were looking for :)
Description
This module provides tools for monitoring and profiling of any data during the request execution, for both main request and any ajax requests made on the page. It was built with plugins in mind and can easily be extended to collect any data specific to your project or application. It has a lot of built in features too: request time, memory consumption, database queries, PHP detailed profiling, so you are good to go even if you don't want to code any specific extensions, but if you do - you can do real magic with it too.