[SkyMarshal]

Same question but for MacOS. There don't seem to be many good ones for it.

[airstrike]

Unfortunately, Preview has been the best reader in my experience. I say "unfortunately" not because it is inherently bad, but because it is a sad state of affairs when nobody can build something better than the barebones native tool

[SkyMarshal]

Just found this one I hadn't seen before, free version may suffice: https://highlightsapp.net/

[moritz]

Try Skim