Rob Cole's RawPlusJpeg LightRoom Plug-In, forked at version 2.5.2 (circa 2014)
The robcole.com website has been dead for several months, and folks have been scrambling to find surviving copies of the RawPlusJpeg plug-in.
So I uploaded my last download of RawPlusJpeg here, after checking that the license allows it. This was version 2.5.2.
Apparently a version 3.0 also existed, so if you have it, please share it! http://feedback.photoshop.com/photoshop_family/topics/import_matching_raw_file