Ionic are free, “do wtf you want with” pixel-perfect icons. They come as vectors in SVG format, with 24 x 24 bounding box and 1.5px stroke. There are 160 icons and new icons added every week.
Icons are totally free, no strings attached. Use those icons in any of your or you client’s projects.
Download: Iconic — Free “do wtf you want with” pixel-perfect icons