Icons8 - Free app for Mac & Windows already containing 39,800 icons. Allows to search and import icons…
Feather Icons - Simply beautiful open source icons
Streamline - Streamline is a web-based vacation rental software that manages vacation rental properties with flipkey integration, online booking, lead management, credit card processing, etc.
Health Icons - Free, open source icons for any healthcare project
IconStore - Free icon packs by first-class designers
Iconscout - Design Resource Marketplace.