100+ Brands Icons And Color Style Guides by Dan Leech
Dan Leech just finished a major overhaul of Simple Icons – set contains 100+ PNG icons for popular websites, apps and organisations, all in eleven sizes (16, 24, 32, 48, 64, 128, 256, 512, 1024, 2048 and 4096 pixels squared).
All images (1000+) are now transparent PNG files, leaving their backgrounds free to be filled using CSS. A full list of colour codes can be found in the GitHub repository readme file.
Download Simple Icons from here.