Radix Icons - A crisp set of 15×15 icons. Open source.
Squircle-less iOS 14 icons - Your favourite iOS14 app icons reimagined
MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
System 1 iOS 14 Icons - Bring your iPhone back to the good old days
Ayecon - Ayecon is an app that allows you to easily make icons according to the required dimensions.
Fluo - Alternative home screen icons