| Category | License | Title | Info | Download |
|---|---|---|---|---|
| OCAL | CC0 Public Domain | scientist Isaac Newton |  |  |
| OCAL | CC0 Public Domain | Steren Gear |  | |
| OCAL | CC0 Public Domain | spannerRemix |  | |
| OCAL | CC0 Public Domain | gears |  | |
| OCAL | CC0 Public Domain | coil spring |  | |
| OCAL | CC0 Public Domain | Quantum mechanics |  | |
| OCAL | CC0 Public Domain | robot |  | |
| OCAL | CC0 Public Domain | schrodingerscat |  | |
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