Here are the 10 free icon sets for your app design.
Colorful Stickers – 20 Icons
This minimal icon set is designed by Dryicons.
PNG: 256×256, 128×128, 64×64, 48×48, 32×32, 16×16
ICO, ICNS: 128x128px
The Icon set composed of 43 icons, .ICO and also 256×256 PNG format.
25 Vector Icons
Glyphish icons are carefully crafted for iOS tab bars, toolbars, nav bars and table rows which are also perfect for Android, Windows Mobile, websites, UI design, t-shirts, tattoos, stencils, stickers and much more.
The set includes the icons address card, bar graph, calendar, clock / time, conference device, contact, documents, draft, mail, marker, milestone, notes, portfolio, and many more.