There are a lot of options for Lemmy, but beware they still need to mature a bit. The two apps I keep using the most are Thunder and Connect for Lemmy. Lots of users swear by Liftoff but I find the aesthetics a bit lacking for me. There’s also Lemming which is the most barebones but has a great UI for something that has only had a couple of alpha releases. Most if not all of these are available to download from Github.