Description Link
Paul's website: High voltage, Tesla coils, microcontrollers
Paul's blog: Microcontrollers, programming, high voltage
Moritz's website: Electronics, IT, 3D printing
Marco's website: electronics, high voltage, computer science
Frickler's website: electronics and tinkering
GigaBecquerel's website: Amateur Nuclear Physics
Website of tSYS and Manawyrm: Electronics, hacks and retrocomputing
Timo's website: Electronics, LoRaWAN and Smart Home
Aaron's website: E-Ink displays, Reverse-engineering
Website of the German ham radio club H23 Uelzen
Website of Günther Fromhagen (DK8OH)
Website of Michael Haugrund (DF2OK)
Website of Werner Haugrund (DJ9HZ)
Website of J.Nut from Thailand: Microcontroller, software and hardware
Website of Alexander C. Frank: Electronic projects, calculation tools and rf stuff
Burkhard Kainka's web site: Lots of circuits, tinkering
Working Group for Amateur Radio and Telecommunications in Schools
Website of Sergey Kiselev: Retro x86 and home computer
Circuit diagrams / service manuals for various devices
Fingers World - Mad crafts and projects
Simon Küppers' website: Microcontroller projects
Electronics tinkering for beginners
Nixie, VFD, Numitron watches
Lots of things to know about tubes
Large collection of tubes


Description Link
Mosfetkiller Board: Electronics, High Voltage, Digital Technology
Repair forum for consumer electronics and home appliances
Club dedicated to the preservation of classic computers
AVR Freaks Atmel Community

3D printing

Description Link
UltiMaker Thingiverse: Models for 3D printing
Printables by Josef Prusa: 3D models database
FreeCAD - 3D parametric modeler
OpenSCAD: software for creating solid 3D CAD objects
UltiMaker Cura: 3D printing software
OctoPrint: The snappy web interface for your 3D printer