| 1 | 20,710 | 23,012 | geometry | Geometric primitives and algorithms for Ruby |
| 2 | 50,589 | 34,078 | engineering | Tools for Mad Engineers and those who want to be |
| 3 | 52,879 | 34,078 | jsgf | A parser and DSL for JSGF files |
| 4 | 60,370 | 59,168 | dxf | Read and write DXF files using Ruby |
| 5 | 61,201 | 94,906 | audio | Access all of your audio devices from the comfort of Ruby |
| 6 | 91,643 | 94,906 | fasteners | Models for Nuts, Bolts, and Screws |
| 7 | 92,027 | 94,906 | stl | Read and write STL files |
| 8 | 97,876 | 59,168 | eaglecad | Everything you need to bend Eagle CAD projects to your will |
| 9 | 102,600 | 94,906 | gerber | Tools for working with Gerber and Extended Gerber files |
| 10 | 115,763 | 59,168 | optical | The home of all ruby optics |
| 11 | 116,406 | 59,168 | clips | The C Language Integrated Production System (CLIPS), but in Ruby |
| 12 | 122,038 | 94,906 | canvas | Fingerpainting in Ruby, without the fingers, or the paint |
| 13 | 139,147 | 94,906 | fritzing | Read and write Fritzing sketches |
| 14 | 139,581 | 94,906 | manufacturing | Tools for generating manufacturing drawings and related files |
| 15 | 155,137 | 94,906 | speech | Adventures in the Land of Speech Recognition |
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