I'm tired of modern web design. These icons are even not intended to be used on toolbar buttons, but for silly landing page lists. Landings that are all the same on every website.<p>I miss silk icons that were ubiquitous in late 2000s: <a href="http://www.famfamfam.com/lab/icons/silk/" rel="nofollow">http://www.famfamfam.com/lab/icons/silk/</a>. I miss Tango Project icons, although Gnome went off-the-rails in their UI design. I miss small UI elements, like on freaking Windows 95 desktop, not optimized for pressing with finger, despite being shown on desktop.
Not all of the presented icon sets are Open-Sourced. Some are, some are free and for some you have to pay with information about you like your email address. So the title sounds nice but it is just wrong.
also, just remember unicode is packed with icons though I find you do have to check if they render correctly.... but mostly they just work though you may need to make your font a bit bigger or it may look like<p>UPDATE: apparently.... HN Isn't unicode friendly...<a href="https://pasteboard.co/IpxYWjH.png" rel="nofollow">https://pasteboard.co/IpxYWjH.png</a>