Luchesa - flat icons into different categories: Design, Food, SEO, Web, Strategy, Management, Finance, Money, E-Commerce, Shopping, Christmas & New Year and Others. Good choice for use in web design and interfaces.
Common file extensions that are good to know. 25 categories: Text, Data , Audio, Video, 3D, Raster, Vector, Page Layout, Spreadsheet, Database, Executable, Game, CAD, GIS, Web, Plugin, Font, System, Settings, Encoded, Compressed, Disk Image, Developer, Backup, Misc.
Outline and social icons