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Computer & hardware
Glyph
Ionicons
plus
Black
512x512
round, plus
UI
Pictype Free Vector Icons
Add, plus
Mixed
Pittogrammi
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Windows 8 metro style
Flat UI Icons Free
Picol Vector
plus, Badge
Social media
Picons Social
Google+, google, plus
Desktop apps
Brands & applications
google, plus
plus, google
Pyconic Icons 3 - free
plus, goggle, Circle
plus, goggle
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Business & finance
Minicons Free
plus, zoom
45x45
Metro UI Dock
plus, Mb
256x256
IcoMoon
32x32
Black ToolBar Icons
40x40
IconSweets
plus, sizes
50x50
Wireframe mono icons
Add, document, plus
48x48
Folder, plus