The Tango Icon Library as rasterized PNGs.
This repository copies 213 SVG icons from out of http://tango.freedesktop.org/releases/tango-icon-theme-0.8.90.tar.gz (flattening the directory naming scheme) and additionally provides PNG editions of that suite, such as at 64x64 and 512x512 resolution.
See Tango Icon Library for the original project, whose development stopped in 2009.
The tango-icon-theme-0.8.90.tar.gz COPYING file, in full:
The icons in this repository are herefore released into the Public Domain.