Many of these sites offer commercial licenses with their free files. Some of the sites offer one new free font each day or each week. Do not assume that a commercial license is granted. Instead, be sure and check the license yourself.
Creative Fabrica Daily Gift: https://www.creativefabrica.com/daily-gifts/
Creative Fabrica Freebies: https://www.creativefabrica.com/freebies/free-fonts/
Creative Market: https://creativemarket.com/free-goods
Fontesk: https://fontesk.com/license/free-for-commercial-use/
Omnibus-Type: https://www.omnibus-type.com
Font Library: https://fontlibrary.org/en
So Fontsy: https://sofontsy.com/collections/free
The League of Movable Type: https://www.theleagueofmoveabletype.com/
Use & Modify: https://usemodify.com
OSP Foundry: http://osp.kitchen/foundry/
Harold’s Fonts: http://haroldsfonts.com/groups/free/
Badass Libre Fonts by Womxn: https://www.design-research.be/by-womxn/
Beautiful Web Type: https://beautifulwebtype.com/
Velvetyne Type Foundry: https://velvetyne.fr
Font Bundles: https://fontbundles.net/free-fonts
Google Fonts: https://fonts.google.com/
Font Library (Google Font tags): https://katydecorah.com/font-library
Hungry JPEG: https://thehungryjpeg.com/freebie-of-the-week
Font Meme: https://fontmeme.com/fonts/free-fonts-collection/
Crella: https://crella.net/free-fonts/
Free Design Resources: https://freedesignresources.net/
Font Squirrel: https://www.fontsquirrel.com/