- /geeks
- Abandoned Technology
- All Free Pictures (Creative Commons and Public Domain)
- Closer and Closer Macro Photography -
- Computer History
- Digital Infrared
- Geek Porn
- Hardware
- Infrared
- Infrared Photography
- InfraRed Photography - and info about it
- Macro Photography
- microscope
- Microscopy
- Microscopy Art
- MOON Shots
- Moon/Luna
- Processors group
- Therm-App thermal camera users
- Vintage Computers