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Mixed
Outline
bitsies!
lab, laboratory, research
Black
512x512
Flat
Stash
Hourglass, test, monitor
Tomato
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Glyph
gcons
test
438x512
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UI
Windows 8 metro style
tube, test
DarkSlateGray
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Education & science
Handdrawn
Brainy Icons Free — 36 Science and Education Icons
Biology, genetics, science
64x64
Linecons Free – Vector Icons Pack
science, vials, test
Gaming & gambling
3D
Free Game Icons
medical, test, research
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Mobile apps
Free Retina Icon Set
science, deratization, disinfestation
60x60
Photography & graphic design
32x32 Free Design Icons
Color, test
LightBlue
32x32
line, test
Clear, Hard, opacity
Pretty Office 10
test, paper, Grade
Gainsboro
Signs & symbols
Free 3d Glossy Interface Icon Set
yes, mark, validation
yes, ok, Check
Lavender
Healthcare & medical
MedICO Free Medical Icons
Pixel
Fugue Icons
television, test
16x16
Business & finance
Smooth
Pretty office icons part 5
test, document, write
DarkGray
256x256
Photorealistic
I love icons
test, Chemistry, lab
Desktop apps
16x16 Free Toolbar Icons
ok, tick, Blue
DodgerBlue
IconSweets 2
science, Chemistry, test
40x40
Sunny Day
test, laboratory, Chemistry
400x400
Super Vista
Chemistry, science, test
Avatars & smileys
X-mac
The Centigrade MedicalSeries
tubes, laboratory, test