Version 4.9.0 includes new regridder features, JSON, and ncap2 fixes. Notably, this version simplifies the weight-application interface, parallelizes ncremap in stand-alone mode, and completely revamps, improves, and accelerates the sub-gridscale weight application algorithm.
The NCO conservative weight-generator algorithm also debuts. Previously, ncremap always used ESMF or TempestRemap to make weights. Use 'ncremap -a nco' to get NCO's conservative weight generation. NCO will always support ESMF and TR which are more time-tested. However, NCO has some unique features, like an option to output the overlap mesh in SCRIP format.