We have just released the OpenGrADS Bundle version 2.2.1.oga.1 for Windows, macOS and Linux. This is a major release after a 2 year hiatus. This release fixes an earlier limitation that prevented access to https:// OPeNDAP sites and bring several new features such as dynamically linked graphical backends.
https://sourceforge.net/projects/opengrads/files/grads2/2.2.1.oga.1/