| 1 | 20,893 | 17,060 | geometry | Geometric primitives and algorithms for Ruby |
| 2 | 52,138 | 26,624 | engineering | Tools for Mad Engineers and those who want to be |
| 3 | 54,242 | 57,584 | jsgf | A parser and DSL for JSGF files |
| 4 | 62,183 | 41,879 | dxf | Read and write DXF files using Ruby |
| 5 | 63,642 | 57,584 | audio | Access all of your audio devices from the comfort of Ruby |
| 6 | 94,002 | 105,941 | stl | Read and write STL files |
| 7 | 94,108 | 105,941 | fasteners | Models for Nuts, Bolts, and Screws |
| 8 | 100,576 | 41,879 | eaglecad | Everything you need to bend Eagle CAD projects to your will |
| 9 | 105,392 | 105,941 | gerber | Tools for working with Gerber and Extended Gerber files |
| 10 | 118,522 | 105,941 | optical | The home of all ruby optics |
| 11 | 118,744 | 57,584 | clips | The C Language Integrated Production System (CLIPS), but in Ruby |
| 12 | 124,815 | 57,584 | canvas | Fingerpainting in Ruby, without the fingers, or the paint |
| 13 | 143,171 | 105,941 | fritzing | Read and write Fritzing sketches |
| 14 | 143,523 | 105,941 | manufacturing | Tools for generating manufacturing drawings and related files |
| 15 | 157,476 | 57,584 | speech | Adventures in the Land of Speech Recognition |
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