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Best FOSS alternative to Nova Launcher?
(lemmy.ml)
Would really love a launcher that can format icon shapes so that they're all uniform in shape, like Nova Launcher ...but open source. 
It's not like Nova Launcher, but I've been really enjoying Kvaesitso. It does support icon transformations (better than Nova does IMO) but provides a very different interface that's focused on search.
I love Kvaesitso! It's my current pick as well. I like that it does its own thing and provides a very different UX from the rest of the Android launchers, which are always variations on either AOSP or the iPhone launchers. And it does it very well, with a very good looking UI!
For these reasons though, it is not similar to Nova at all.
On a similar note, I have been enjoying the KISS launcher and made it work for me. Had I looked at Kvaesito before that may have been my choice instead. Its a weird concept at first but works well.
I've been on this for a couple months and have enjoyed the experience as well. I imagine some of the overall issues encountered are more about my phone being nearly 6 years old than the launcher itself, but is the default weather widget broken for you as well?
I wasn't a fan of the built-in weather widget so I immediately replaced it, so I have no experience with it being nonfunctional, sorry.
Can it reformat icon shapes?
Yes