we have just released a new Admin template with CRUD generator for Laravel 5.5. We call it Craftable. It's a starter kit for building administration interfaces and it's completely free. With provided generator you can scaffold an CRUD administration for your existing eloquent models very quickly.
It's made of several packages that are all very well documented https://docs.getcraftable.com
This is our first step into the world of open-source, so we are really looking for you feedback :) And if you really like it, we would be very happy to every star on https://github.com/BRACKETS-by-TRIAD/craftable :)
BRACKETS dev team