| 1 | 20,173 | 63,432 | geometry | Geometric primitives and algorithms for Ruby |
| 2 | 49,874 | 63,432 | engineering | Tools for Mad Engineers and those who want to be |
| 3 | 51,248 | 63,432 | jsgf | A parser and DSL for JSGF files |
| 4 | 58,250 | 63,432 | audio | Access all of your audio devices from the comfort of Ruby |
| 5 | 59,723 | 30,305 | dxf | Read and write DXF files using Ruby |
| 6 | 90,425 | 63,432 | fasteners | Models for Nuts, Bolts, and Screws |
| 7 | 90,518 | 63,432 | stl | Read and write STL files |
| 8 | 97,889 | 30,305 | eaglecad | Everything you need to bend Eagle CAD projects to your will |
| 9 | 100,736 | 63,432 | gerber | Tools for working with Gerber and Extended Gerber files |
| 10 | 113,345 | 63,432 | optical | The home of all ruby optics |
| 11 | 115,800 | 63,432 | clips | The C Language Integrated Production System (CLIPS), but in Ruby |
| 12 | 118,206 | 63,432 | canvas | Fingerpainting in Ruby, without the fingers, or the paint |
| 13 | 135,641 | 63,432 | fritzing | Read and write Fritzing sketches |
| 14 | 136,029 | 63,432 | manufacturing | Tools for generating manufacturing drawings and related files |
| 15 | 153,663 | 63,432 | speech | Adventures in the Land of Speech Recognition |
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