F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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Would really love a launcher that can format icon shapes so that they're all uniform in shape, like Nova Launcher ...but open source. 
The lynx launcher has been my go to, they advertise as "Sleek - Fast - Unobtrusive" and have zero trackers according to Exodus. Not 100% if they're FOSS but I love the launcher and here's their website: https://www.lynxlauncher.de/
Been using Neo Launcher since Nova sold out. Yes, it can format icon shapes.
Thats a different neo launcher. The one he's talking about isn't available on the google play store.
Lemme find you an f-droid link
Edit: here you go https://apt.izzysoft.de/fdroid/index/apk/com.saggitt.omega
Its on izzydroid. You'll want to use an f-droid client to download it and keep it updated. There are a bunch, the official one is an easy place to start, but I really like droid-ify. There's also neo store which is developed by the same person/people who make neo launcher, but personally I find neo launcher pretty clunky
The github page I've linked includes a link to F-droid