textfiles.com : What this site offers is a glimpse into the history of writers and artists bound by the 128 characters that the American Standard Code for Information...
Genericons : Genericons are vector icons embedded in a webfont designed to be clean and simple keeping with a generic aesthetic.
Use genericons for instant HiDPI, ...
Mind42 : Collaborative mind mapping in your browser
System UIcons : A free icon set designed for systems and products. Use how you want, without attribution.