| 1 | 20,090 | 45,460 | geometry | Geometric primitives and algorithms for Ruby |
| 2 | 49,740 | 67,544 | engineering | Tools for Mad Engineers and those who want to be |
| 3 | 51,143 | 67,544 | jsgf | A parser and DSL for JSGF files |
| 4 | 58,044 | 32,763 | audio | Access all of your audio devices from the comfort of Ruby |
| 5 | 59,588 | 67,544 | dxf | Read and write DXF files using Ruby |
| 6 | 90,269 | 67,544 | fasteners | Models for Nuts, Bolts, and Screws |
| 7 | 90,356 | 67,544 | stl | Read and write STL files |
| 8 | 97,825 | 45,460 | eaglecad | Everything you need to bend Eagle CAD projects to your will |
| 9 | 100,581 | 67,544 | gerber | Tools for working with Gerber and Extended Gerber files |
| 10 | 113,144 | 67,544 | optical | The home of all ruby optics |
| 11 | 115,659 | 29,467 | clips | The C Language Integrated Production System (CLIPS), but in Ruby |
| 12 | 117,985 | 45,460 | canvas | Fingerpainting in Ruby, without the fingers, or the paint |
| 13 | 135,371 | 67,544 | fritzing | Read and write Fritzing sketches |
| 14 | 135,770 | 67,544 | manufacturing | Tools for generating manufacturing drawings and related files |
| 15 | 153,394 | 67,544 | speech | Adventures in the Land of Speech Recognition |
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