You’ll get a lot of responses but for me (excuse the nostalgia), icon design peaked with famfamfam’s (aka Mark James’s) Silk iconset from ~2005. It was a shame they were never available at higher resolutions (or as SVG), though I’m betting AI (either as Adobe Illustrator or Artificial Intelligence) can probably rectify that these days (and generate subpar additional icons to expand the set).

View: https://peacocksoftware.com/silk

Download: https://github.com/markjames/famfamfam-silk-icons/tree/maste...

https://lucide.dev/

I really like https://phosphoricons.com/

But other than that, I also usually default to Material UI Icons.

I've used Tabler for everything so far (free, 4500 icons)

https://tabler.io/icons

I’ve used FlatIcon extensively. My use case is video games rather than web design.

https://www.flaticon.com/

https://www.svgrepo.com I find the site very user friendly as it lets you customize the stroke's width, color etc, see how it looks like and copy the modified version.

I like Material Symbols best. Largest selection AFAIK and simple enough that you can create unique ones that fit in.

Honestly, I always default to material icons unless a project calls for a very specific style. The coverage is just so dang good I rarely find a scenario without an appropriate icon and the style is neutral enough to blend in with a number of UI designs.

famfamfam of course, the only set one will ever need