Oh my gosh, there are so many! I suggest exploring
Maxis Match CC World.They catalog simmers that don't have ad walls on their downloads and update daily.
I also recommend that as you collect CC you put them in folders to make the CC easier to find. Personally I have separate folders for hair and clothing and within those folders, I have subfolders that identify CC by their creator, and then another subfolder to identify the different categories that the creator may have.
If you decide to download Mods do not put them in subfolders!