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for launcher you can use Lawnchair, it doesn't have so many things but it support quick switch in rooted phones and have almost all the basic features link - https://www.apkmirror.com/apk/lawnchair/ or https://github.com/LawnchairLauncher/lawnchair/releases
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Not "popular" but I left Nova Launcher for Neo Launcher. Niagara Launcher wasn't too bad, but there were a couple things that I didn't end up liking. The scrollable alphabet was really cool though.
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Kiwi browser is a good alternative, it supports Chrome extention in Android and also half often source. Get it here https://github.com/kiwibrowser/src or https://play.google.com/store/apps/details?id=com.kiwibrowser.browser
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Add the 'phone dialler' catagory , I think the best is Koler link - https://github.com/Chooloo/koler or https://f-droid.org/packages/com.chooloo.www.koler/
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The best gallery I've been using for over 4 years now is QuickPic. Sadly it has been dead for a while but now one guy reverse endineered it and keeps it updated: https://github.com/WSTxda/QP-Gallery-Releases