| 1 | 20,867 | 14,613 | geometry | Geometric primitives and algorithms for Ruby |
| 2 | 51,632 | 61,388 | engineering | Tools for Mad Engineers and those who want to be |
| 3 | 53,644 | 61,388 | jsgf | A parser and DSL for JSGF files |
| 4 | 61,571 | 99,251 | dxf | Read and write DXF files using Ruby |
| 5 | 62,914 | 99,251 | audio | Access all of your audio devices from the comfort of Ruby |
| 6 | 93,190 | 99,251 | fasteners | Models for Nuts, Bolts, and Screws |
| 7 | 93,206 | 99,251 | stl | Read and write STL files |
| 8 | 99,705 | 99,251 | eaglecad | Everything you need to bend Eagle CAD projects to your will |
| 9 | 104,361 | 61,388 | gerber | Tools for working with Gerber and Extended Gerber files |
| 10 | 117,371 | 99,251 | optical | The home of all ruby optics |
| 11 | 117,764 | 99,251 | clips | The C Language Integrated Production System (CLIPS), but in Ruby |
| 12 | 123,826 | 99,251 | canvas | Fingerpainting in Ruby, without the fingers, or the paint |
| 13 | 141,816 | 61,388 | fritzing | Read and write Fritzing sketches |
| 14 | 142,169 | 61,388 | manufacturing | Tools for generating manufacturing drawings and related files |
| 15 | 156,341 | 99,251 | speech | Adventures in the Land of Speech Recognition |
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