|- | Clavier tuning optimization | | Music | | [[]] | |-
|- | Collector | User:zmatt | | | [[]] | |-
|- | Component tester | | Electronics, Soldering | | [[]] | |-
|- | Computer restoration | | 1337 Skillz, Electronics | | [[]] | |-
|- | Configuration of a brocade poe switch | | Coding, Programming | | [[]] | |-
|- | Container Presence | | ESP8266, Esphome, Electronics | | [[]] | |-
|- | CoreAnet | User:buzz | 3D Printing, Reprap, Mechanics | | [[]] | |-
|- | Creality Ender 3 | | 3D Printing, Pokoning, Screaming | | [[]] | |-
|- | CryptoSlots | User:buzz | | | [[]] | |-
|- | Cyberdecking | User:buzz | Arduino, Raspberry pi, Recycling, Dremeling, Electronics, Soldering, Linux | | [[]] | |-
|- | Cylinder POV | | Arduino, Soldering, Programming | | [[]] | |-
|- | Cytherea | | Megasquirt, Mechanics, Electronics, Soldering | | [[]] | |-
|- | DECwriter III | | | | [[]] | |-
|- | DHP-1565 OpenWrt | Dennis | Reading docs, Building OpenWrt | | [[]] | |-
|- | DIP28 to DIP32 converter | Dennis | Soldering | | [[]] | |-
|- | DIY Ambilight | | ESP8266, Raspberry pi, Electronics, Soldering, Software, Linux | | [[]] | |-
|- | DIY DSP | | Soldering, Programming | | [[]] | |-
|- | DIY Spot Welder | | Experimentation, Electronics | | [[]] | |-
|- | DIY USB microscope | Dennis | Optics, Taking stuff apart | | [[]] | |-
|- | DOS gaming | User:buzz, Id | DOS | | [[]] | |-