List of FOS/Libre fonts.
OFL - Google Fonts - Designed to provide the web with open source fonts, from creators around the world. - https://fonts.google.com/
OFL - The League of Moveable Type - Open source font foundry. - http://theleagueofmoveabletype.com/
GPL - GNU FreeFont - Libre fonts created by the GNU Project. - https://www.gnu.org/software/freefont/
OFL - Liberation Fonts - Another set of Libre fonts designed to be compatible with a small set of common Microsoft fonts. - https://github.com/liberationfonts/liberation-fonts
You can try out FontForge, which is open source software for typeface creators.
Homepage: https://fontforge.org/en-US/