There is a bunch of very talented coders who are creating many of these things for iNat. I have summarised the ones I know about here - https://forum.inaturalist.org/t/web-resources-extensions-and-add-ons-for-inaturalist-wiki/52020
(I am having trouble editing the post today to add more stuff. Will get to it as and when.)
Some of the things on the wishlist here have already been created by iNatters and can be found in the list linked above, for e.g.
See @japh ‘s addon
See @pisum alternative page