Open source
Bootstrap Icons
Free, open source icon library with over 2,000 SVG icons
Icon LibrariesFree Bootstrap SVG icon set
12 tools like Noun Project, chosen by what they do. About Noun Project
Free, open source icon library with over 2,000 SVG icons

Large consistent icon sets in SVG and PNG formats

Web tool to build your own icon font from SVG files
Simple open source icons drawn on a 24x24 grid
Open source UI icon pack with 480 icons for common actions
Icon sets in several styles, with free and Pro packs

Open source neutral icon set for designers and developers