Finding sources for some things can be tricky and is quite a case by case situation. If you aren't sailing much lately take a look at the megathread if you haven't already for updated resources and tips.
If you liked Apollo give Voyager a try, they made it to look and feel very similar. It's a WPA so it's cross platform and there's no app store involved.
I always used RiF and never tried any other third party app because I didn't feel the need to. Coming to lemmy I tried every alternative I found and stayed with Voyager (formerly wefwef). It's a WPA inspired by the defunct Apollo client for reddit and I'm liking it even more than RiF, although it's quite different. Being a WPA streamlines the development and it shows, it reached v1.0 a few days ago. Jerboa was ok when it was the only alternative to plain web interface, but right know is quite behind imo.