Radix Icons - A crisp set of 15×15 icons. Open source.
1000 Detailed Creative Icons - Carefully designed icons with tons of fine details
Bjango App Icon Templates - App icon templates for PS, Ai, Sketch and Affinity Designer
MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
Pixel Icons - 6,500 unique icons designed for perfection 🚀
App Icon Resizer - A service to resize your app icon to all needed resolutions