Flat Icons for Desktop applications?, (like a Map Editor)

[hydexon]

Hello.

I'm finding an flat icon set for my Map editor for my engine the UI itself has an dark scheme, and it's inconsistent because uses fully colored/shaded icons from the quite old Oxygen Icon them and some Adwaita icons from GNOME, and looks very inconsistent and was looking for Flat icons will be more appropiate but the issue is: I only can find icons for Web applications!.
I tried with the Syncfusion Metro Studio it's free and good but i use mostly an Linux machine an Syncfusion is Windows only, i found an online flat icon library but only can download one per icon (and i need lots of them) and some specific like Edit icons like (Move, Translate, Rotate, Scale, etc) , and someone can give me a suggestion?, ty.