How to Add Maps to a Server?

When I used to own a server, there was a site I went to that had a list of about 100 TTT maps. I would download them directly into the maps folder (linux… simple wget) and then would copy them over to the fastdl.
Now, I can’t find any .bsp map list.
However, I found some TTT map packs on workshop… AWESOME.
Although, after adding them to collection etc. It makes my clients download ALL the maps before joining the server. Before, it only made the clients download the current map.
Any help?