This post is all about latest and trending free icons. We all know the importance of good icons in web designing. Here are 22 free outline icon sets that will fit like a glove on your flat designed website or application.
Othericons

Minimal Outline Icons

hicons

budicon tester

Sketch icon set by Pausrr

Free icons

Weather Icon Font

Free Icons

100 Free Vector Icons

Icons Preview

Icons – Free download

Metrize Icons

Drink Icons

35 a simple free icon

Free Whycons

30 Free Icons (with PSD)

Coucou Icons

36 Thinicons Free PSD

Simplicons

Layouts icons freebie

Linecons

32 ICONS FOR FREE

Here is another high-quality icon set with more than 700 icons in 40+ themes for business
https://tilda.cc/free-icons/
It would be great if you could include that in your list.