PNG ICO ICNS SVG MORE
Signs & symbols
Glyph
Alchemy
Alchemy, Idea, minimal
Black
512x512
PNG SVG MORE
Miscellany Web icons
Idea, light, lightbulb
315x512
Mixed
Social Messaging & Productivity Mix Icons
light, Idea, bulb
506x512
UI
Very Basic. Android L (Lollipop)
electricity, Light bulb, Idea
Icons Solid
Idea
WPZOOM Developer Icon Set
Idea, bulb, light
PNG MORE
Mobile apps
Free Retina Icon Set
brightness, Source, day
60x60
PNG ICO ICNS MORE
Business & finance
48x48 Free Time Icons
Strike, Idea, light
48x48
Mimi Glyphs
Idea, light
16x16
Black ToolBar Icons
Idea, lamp, light
40x40
Desktop apps
16x16 Free Toolbar Icons
lamp, light, question
Ecqlipse 2
Idea, lightbulb
128x128