Lojban is a conlang with a history that goes back to 1955, when its predecessor, Loglan, was created by James Cooke Brown to investigate the Sapir–Whorf Hypothesis. Legal issues and the will to democratize the language led some of his followers to develop Lojban in 1987. The baseline was published in 1997.
Lojban is designed to be culturally neutral, and to express complex logical constructs. Its grammar has no irregularities nor ambiguities, and can be parsed by machines like a programming language.
I know very little about Lojban at the moment, but I find the concept fascinating, especially when compared to the ambiguity of Toki Pona.