The story
PathEngine was founded in 2000. The first version of PathEngine SDK was released in early 2002. By the end of 2005, over 50 finished products had been released that used PathEngine.
In 2007, the 5.10 version was released. Improvements included a new graph search core and several bugfixes. In 2010, PathEngine released version 5.23.
From Wikipedia’s article on PathEngine, shared under CC BY-SA 4.0.3