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Desktop apps
Smooth
Icons Mega Pack 1 and 2
Spotify
YellowGreen
256x256
Social media
Flat
Freebie: Social Media Icons
LimeGreen
64x64
Soft Social Icons
podcast, music, Spotify
48x48
PNG MORE
Mixed
Simply 8-bits #11
96x96
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Glyph
Unicons - Vector Icons Pack - free
podcast, Spotify, music
Black
512x512
Minicons Social
Free Colorful Icons
360x360
Simple Icons
4096x4096
Appicns
Spotify, appicns
512x513
Mobile apps
Squareplex
OliveDrab
Plex for Android
Circular icon set
The Circle Icons
Prime Dock Icons 2
UI
Metro UI Icon Set
SEO & web
Metro Uinvert Dock
Perqui
Pixel
Seize
DarkOliveGreen
16x16
Signs & symbols
48px icons 4
Olive
Metro UI Dock
Music & multimedia
Flurry for Audio