| 1 | 20,511 | 21,702 | geometry | Geometric primitives and algorithms for Ruby |
| 2 | 50,432 | 38,007 | engineering | Tools for Mad Engineers and those who want to be |
| 3 | 52,114 | 63,493 | jsgf | A parser and DSL for JSGF files |
| 4 | 59,849 | 94,717 | audio | Access all of your audio devices from the comfort of Ruby |
| 5 | 60,193 | 68,264 | dxf | Read and write DXF files using Ruby |
| 6 | 90,763 | 94,717 | fasteners | Models for Nuts, Bolts, and Screws |
| 7 | 91,080 | 117,132 | stl | Read and write STL files |
| 8 | 97,792 | 104,717 | eaglecad | Everything you need to bend Eagle CAD projects to your will |
| 9 | 101,747 | 104,717 | gerber | Tools for working with Gerber and Extended Gerber files |
| 10 | 113,809 | 131,144 | optical | The home of all ruby optics |
| 11 | 116,642 | 94,717 | clips | The C Language Integrated Production System (CLIPS), but in Ruby |
| 12 | 120,216 | 117,132 | canvas | Fingerpainting in Ruby, without the fingers, or the paint |
| 13 | 137,195 | 147,182 | manufacturing | Tools for generating manufacturing drawings and related files |
| 14 | 137,250 | 147,182 | fritzing | Read and write Fritzing sketches |
| 15 | 155,214 | 131,144 | speech | Adventures in the Land of Speech Recognition |
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