I found these websites a while back and I’ve absolutely loved them for UI design. They each host thousands of (or in the Noun Project’s case, a couple million) simple icons for royalty-free use in any project. They come in several different formats, including the vector format .svg for infinite scale. Between the two, I’ve always been able to find what I’m looking for. I’ve used these in posters, GUIs, advertisements, you name it. Hope this helps someone.
I should note here as well that The Noun Project does have a paid subscription option, but if you choose “Basic Download” when downloading an icon, you can still use it for free in your games/publications. You just simply have to abide by their attribution rules.
It literally says the connection isn’t going to be private (encrypted). The little text below is to just warn you not to enter info into the site. Please educate your self
Thatguy is correct in saying that it’s just an issue of not establishing an encrypted connection. I just visited the site and it appears to be working correctly now, so it might have just been a temporary issue.
While we’re revisiting this thread though, I’ve also gone and added Google’s material icons site as well, since I’ve been using that more and more for things like my QUIck UI Design plugin