OctoPrint is the snappy web interface for your 3D printer
G-code generator for 3D printers
G-code generator for 3D printers (RepRap, Makerbot, Ultimaker etc.)
Raspberry PI distro for controlling 3D printers over the web
The open source mesh processing system
FW for ESP8266/ESP8285/ESP32 used with 3D printer
An open process control and laser engraving software solution
DIY project to build a cover, flat panel or combo flip-flat panel