Gekko 3.0 is now (April 2019) officially released as a stable version. Development-wise, the focus is now on further stabilization of the 3.0 version, including help systems etc. (this will be deployed as patches to 3.0). If some syntax or other choices turn out to be unfortunate, this can be dealt with in 3.1.x development versions.

A stable version 2.4 is planned for release in the summer 2019. Further work on the 2.0/2.2/2.4 series will be discontiued afterwards.