Look at that! Flat icons escaped to a new dimension.
Buy Set of Thin Line Flat Design Icons of Business Essentials by PureSolution on GraphicRiver. Set of modern thin line icons of basic business essential tools, office equipment, communication, online support, soc.
A ton of cool material design icons.
Devices Flat Icon Pack - 110 Flat Icons
Furniture Flat Icon Pack - 50 Flat Icons