Fly Fish Food
Overall, a great app with stellar support. The Bulk Edit scenarios work but have some caveats you will want to be aware of. But it appears to meet our needs.
Designed by programmers who are "modern" GUI designers. Orange colors, graphics are a bit oversize and clown-like, but it does everything it claims to do very well. As an old-school programmer, once you get past the graphics it is a more useful tool than the competitors. I like the ability to create a GUI to edit metafields. Works well for me, but tough to train end-users. All and all a good app that does what it claims.
The best metafield editor I've tested. Only downside - it's really slow and glitchy on files of 1000 lines or more, so I have to break down my imports into multiple go's. Other than that - it's super handy.