Themify has launched a free plugin called ‘Themify Icons’ to use in WordPress. The plugin is packed with 320+ pixel-perfect, 100% FREE!
You can add icons on your menu, widget, and text editor with button styling, text, and link. It is very simple to use, and it works with any WordPress site using any theme!
In the past, they released a free icons set that’s designed for developers/designers to use for web and print development. You may use or distribute it for any purpose, whether personal or commercial.