FLOSS alternative for : Google's plus code & what3words. [Solved]

Google Plus code and what3words are geo addressing systems which provide a precise location address (upto 3 sq.m.) of any place on earth. These are used to address location which don't have well known postal address. And these systems provide memorable codes for humans for sharing.

Right now I am using plus codes where I need them. Now I'd rather find FLOSS alternative coz google is known for killing projects that don't get popular but are still useful for some users.

Ref.

https://plus.codes

https://what3words.com

Edit:

Solution found by @mp3@lemmy.ml

Plus codes are actually open-source WhatFreeWords would be an alternative to What3Words.