| 1 | 20,727 | 13,866 | geometry | Geometric primitives and algorithms for Ruby |
| 2 | 50,893 | 145,495 | engineering | Tools for Mad Engineers and those who want to be |
| 3 | 53,196 | 43,639 | jsgf | A parser and DSL for JSGF files |
| 4 | 60,729 | 34,550 | dxf | Read and write DXF files using Ruby |
| 5 | 61,681 | 43,639 | audio | Access all of your audio devices from the comfort of Ruby |
| 6 | 92,015 | 145,495 | fasteners | Models for Nuts, Bolts, and Screws |
| 7 | 92,225 | 51,170 | stl | Read and write STL files |
| 8 | 98,317 | 111,743 | eaglecad | Everything you need to bend Eagle CAD projects to your will |
| 9 | 103,004 | 82,151 | gerber | Tools for working with Gerber and Extended Gerber files |
| 10 | 116,172 | 111,743 | optical | The home of all ruby optics |
| 11 | 116,758 | 63,002 | clips | The C Language Integrated Production System (CLIPS), but in Ruby |
| 12 | 122,608 | 82,151 | canvas | Fingerpainting in Ruby, without the fingers, or the paint |
| 13 | 139,844 | 111,743 | fritzing | Read and write Fritzing sketches |
| 14 | 140,148 | 111,743 | manufacturing | Tools for generating manufacturing drawings and related files |
| 15 | 155,570 | 145,495 | speech | Adventures in the Land of Speech Recognition |
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