Radix Icons - A crisp set of 15×15 icons. Open source.
Feather Icons - Simply beautiful open source icons
MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
Icons8 - Free app for Mac & Windows already containing 39,800 icons. Allows to search and import icons…
Ayecon - Ayecon is an app that allows you to easily make icons according to the required dimensions.
Streamline icons - The world’s largest icon pack library - 100k icons and illustrations.