Distros on old hardware
From ExplainingComputers Video
Over 4GB of Memory
- Lubuntu
- Linux Mint
- MX Linux
- Ubuntu/Zorin
- Linux Lite
Under 4GB of Memory/Less Powerful Processor
- Q4OS
On old systems with 32-bit CPUs
- Q4OS
- AntiX
- Puppy Linux (have found not super straightforward to install, but it all runs in RAM which makes it quite fast)