citizen science you can volunteer to transcribe
Citizen Science! You can volunteer to transcribe labels in a natural history museum, all from the comfort of your own chair. There’s a great set of insects, as well as birds and pressed plant specimens.
Of course I’m disproportionately fond of coleoptera, but I think this is worth spending free time on just to see the photos of the beetle specimens.
Hat tip to @chris_radcliff for the link.