Here is copyright-free unofficial libre documentation on Lojban language. Lojban was created in 1987 and is now supported by its speakers.
Lojban and related stuff is discussed in Lojban chats in Discord messenger.
Unofficial 'Complete Lojban Language' book, June 2020 edition#
Adheres to the original book published in 1997 and:
- fixes mistypes
- fixes contradictions
- adds other new stuff not violating previous stuff
la sutysisku - a slick unofficial dictionary#
The license of the 'Complete Lojban Language' book (a rather permissive one) is specified in the book itself.