many have been previously mentioned over at: https://forum.inaturalist.org/t/current-or-general-favorite-field-guides/656. so make sure you take a look the online resources mentioned there.
also there are some video resources mentioned here: https://forum.inaturalist.org/t/video-taxon-identification-resources-for-plants/25108.
a lot of the FNA stuff in efloras.org has been replicated and improved over at http://floranorthamerica.org/
BONAP is good for viewing multiple species in the same genus on the same page, but often i compare that with what FNA and USDA show, too. they sometimes disagree, or BONAP sometimes doesn’t have a particular plant.
if you’re just trying to identify bird sounds, BirdNET is another option for this.
i used this just yesterday to find a Commelinid with tiny purple flowers in my area that i had seen but not taken a photo of (Murdannia nudiflora).