Current status:

aqsis - Move to openexr2
bcd - Moved to openexr2
blender - seems to be failing for Python related issue
calligra - Moved to openexr2, FTBFS for FontConfig reasons
CTL - Moved to openexr2
darktable -done
Field3D - done
freeimage - done
gegl04 - done
gimp
gmic - done
gstreamer1-plugins-bad-free
hugin - Trying to port to OpenEXR 3
ImageMagick
kdebase3 - Moved to openexr2
kdelibs - Moved to openexr2
kde-runtime - Moved to openexr2
kf5-kimageformats - Moved to openexr2
kio-extras - Done
krita
luminance-hdr - done
luxcorerender - done
opencv - done
OpenImageIO - done
OpenSceneGraph - Working on porting to OpenEXR 3
openshadinglanguage - Working on porting to OpenEXR 3
openvdb - done
pfstools - Move to openexr2
povray - FTBFS on ppc64le only for RPATH issue
prusa-slicer - Expects openvdb to use IlmBase::Half
synfig - done
vigra
vips - done
YafaRay - done

Thanks,
Richard