| 1 | 20,894 | 16,768 | geometry | Geometric primitives and algorithms for Ruby |
| 2 | 51,986 | 55,182 | engineering | Tools for Mad Engineers and those who want to be |
| 3 | 54,096 | 87,723 | jsgf | A parser and DSL for JSGF files |
| 4 | 62,020 | 87,723 | dxf | Read and write DXF files using Ruby |
| 5 | 63,435 | 87,723 | audio | Access all of your audio devices from the comfort of Ruby |
| 6 | 93,794 | 87,723 | stl | Read and write STL files |
| 7 | 93,902 | 55,182 | fasteners | Models for Nuts, Bolts, and Screws |
| 8 | 100,448 | 87,723 | eaglecad | Everything you need to bend Eagle CAD projects to your will |
| 9 | 105,157 | 87,723 | gerber | Tools for working with Gerber and Extended Gerber files |
| 10 | 118,307 | 87,723 | optical | The home of all ruby optics |
| 11 | 118,525 | 42,533 | clips | The C Language Integrated Production System (CLIPS), but in Ruby |
| 12 | 124,717 | 55,182 | canvas | Fingerpainting in Ruby, without the fingers, or the paint |
| 13 | 142,909 | 87,723 | fritzing | Read and write Fritzing sketches |
| 14 | 143,214 | 87,723 | manufacturing | Tools for generating manufacturing drawings and related files |
| 15 | 157,379 | 87,723 | speech | Adventures in the Land of Speech Recognition |
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