| 1 | 20,108 | 35,920 | geometry | Geometric primitives and algorithms for Ruby |
| 2 | 49,768 | 86,038 | engineering | Tools for Mad Engineers and those who want to be |
| 3 | 51,161 | 23,626 | jsgf | A parser and DSL for JSGF files |
| 4 | 58,095 | 86,038 | audio | Access all of your audio devices from the comfort of Ruby |
| 5 | 59,627 | 53,556 | dxf | Read and write DXF files using Ruby |
| 6 | 90,295 | 86,038 | fasteners | Models for Nuts, Bolts, and Screws |
| 7 | 90,375 | 86,038 | stl | Read and write STL files |
| 8 | 97,823 | 86,038 | eaglecad | Everything you need to bend Eagle CAD projects to your will |
| 9 | 100,607 | 86,038 | gerber | Tools for working with Gerber and Extended Gerber files |
| 10 | 113,191 | 86,038 | optical | The home of all ruby optics |
| 11 | 115,698 | 86,038 | clips | The C Language Integrated Production System (CLIPS), but in Ruby |
| 12 | 118,048 | 86,038 | canvas | Fingerpainting in Ruby, without the fingers, or the paint |
| 13 | 135,416 | 86,038 | fritzing | Read and write Fritzing sketches |
| 14 | 135,786 | 53,556 | manufacturing | Tools for generating manufacturing drawings and related files |
| 15 | 153,468 | 86,038 | speech | Adventures in the Land of Speech Recognition |
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