LineIcons might be a bit more popular than iOS 11 icons: Glyphs. We know about 3 links to it since March 2021 and only 3 links to iOS 11 icons: Glyphs. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I downloaded the icons I needed from here. They are from no particular icon pack. I just selected the icons which I felt would fit in well with the theme I was going for and then edited them onto the wallpaper background images on my computer. It’s a tedious process but it becomes easy once you get used to it and the result is worth it ;). Source: over 2 years ago
Icons 8 (Free but sometimes they charge for full Res). Source: almost 3 years ago
Https://icons8.com/icons/ios You can use them by putting this link "https://img.icons8.com/ios/250/000000/icon.png" and just replace the word icon with the name of the icon (with spaces with replaced by a dash). Source: about 3 years ago
Line Icons - 5000+ handcrafted free line icons for modern user interfaces. - Source: dev.to / 9 months ago
Used https://lineicons.com the last time around. - Source: Hacker News / about 1 year ago
Lineicons- Free Icons for web developers and designers. Source: almost 2 years ago
IconStore - Free icon packs by first-class designers
Flat Icons - 20,000 unique, customizable icons with free lifetime updates
Feather Icons - Simply beautiful open source icons
Fluent Icons by Icons8 - Colorful and stylish icons for your projects
Iconoir - A diverse and open-source library with 900+ icons
IconBros - Free and continuously growing high quality icons