Simple library app for Mac?

I use swinsian for managing my library (roughly 60 gigs) and syncing with an old iPod. It’s works great! My only trouble is I can’t easily manage my SD card for my car with it, or make a playlist on it for the vehicle. I used to run Linux mint on an old laptop and there were a bunch of library programs that just worked with the SD card serving as the library. Switching library folders on swinsian is not the easiest process. Any suggestions for library programs for Mac that will do this?