High Quality Content by WIKIPEDIA articles! Qi is a functional programming language developed by Mark Tarver and introduced in April 2005. A new version was reimplemented and issued as Qi II in November 2008. The first version was free software, licensed under GPL. But, as GPL was perceived as unfriendly to commercial use, Qi II is available via two proprietary licenses: one for personal and educational use, and another for producing closed source software.