| 1 | 19,987 | 71,947 | geometry | Geometric primitives and algorithms for Ruby |
| 2 | 49,576 | 101,595 | engineering | Tools for Mad Engineers and those who want to be |
| 3 | 51,037 | 101,595 | jsgf | A parser and DSL for JSGF files |
| 4 | 57,753 | 71,947 | audio | Access all of your audio devices from the comfort of Ruby |
| 5 | 59,366 | 101,595 | dxf | Read and write DXF files using Ruby |
| 6 | 90,053 | 101,595 | fasteners | Models for Nuts, Bolts, and Screws |
| 7 | 90,152 | 101,595 | stl | Read and write STL files |
| 8 | 97,685 | 101,595 | eaglecad | Everything you need to bend Eagle CAD projects to your will |
| 9 | 100,303 | 101,595 | gerber | Tools for working with Gerber and Extended Gerber files |
| 10 | 112,947 | 57,389 | optical | The home of all ruby optics |
| 11 | 115,474 | 57,389 | clips | The C Language Integrated Production System (CLIPS), but in Ruby |
| 12 | 117,687 | 71,947 | canvas | Fingerpainting in Ruby, without the fingers, or the paint |
| 13 | 135,041 | 101,595 | fritzing | Read and write Fritzing sketches |
| 14 | 135,454 | 101,595 | manufacturing | Tools for generating manufacturing drawings and related files |
| 15 | 153,156 | 71,947 | speech | Adventures in the Land of Speech Recognition |
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