| 1 | 20,750 | 19,168 | geometry | Geometric primitives and algorithms for Ruby |
| 2 | 50,768 | 98,195 | engineering | Tools for Mad Engineers and those who want to be |
| 3 | 53,117 | 98,195 | jsgf | A parser and DSL for JSGF files |
| 4 | 60,582 | 63,261 | dxf | Read and write DXF files using Ruby |
| 5 | 61,497 | 63,261 | audio | Access all of your audio devices from the comfort of Ruby |
| 6 | 91,875 | 63,261 | fasteners | Models for Nuts, Bolts, and Screws |
| 7 | 92,102 | 98,195 | stl | Read and write STL files |
| 8 | 98,152 | 98,195 | eaglecad | Everything you need to bend Eagle CAD projects to your will |
| 9 | 102,878 | 63,261 | gerber | Tools for working with Gerber and Extended Gerber files |
| 10 | 115,941 | 98,195 | optical | The home of all ruby optics |
| 11 | 116,600 | 46,658 | clips | The C Language Integrated Production System (CLIPS), but in Ruby |
| 12 | 122,385 | 63,261 | canvas | Fingerpainting in Ruby, without the fingers, or the paint |
| 13 | 139,567 | 98,195 | fritzing | Read and write Fritzing sketches |
| 14 | 139,916 | 98,195 | manufacturing | Tools for generating manufacturing drawings and related files |
| 15 | 155,317 | 98,195 | speech | Adventures in the Land of Speech Recognition |
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