Hi Antoine, a great tools review! Hopefully, if you update it in the future you can review Lunacy https://icons8.com/lunacy too (According to the feedback of users, many of the like it more than Adobe XD). But actually, it is Sketch for Windows.
For free icons they also can use https://icons8.com/ (all PNG up to 100x100 px and SVG icons from “Free Popular” and “Logos” collections are free). Plus there are more free SVG on this page: https://icons8.com/free-icons/. All line icons can be automatically recolored in 2 seconds in the web app or Windows and Mac apps.
Hope it will be useful :)
Icons8 have just released a free Sketch viewer for Windows — https://icons8.com/lunacy.
Maybe it will be useful for those who stick with Sketch or who gets .sketch files while working in Windows :)
Hi Diana, information about https://icons8.com/ is kind of outdated. There are 35,000 icons already on icons8 website. All of them free in PNG and some of them free in other formats too. For example, https://icons8.com/articles/we-love-svg-googlefonts-foricons/