https://www.dreamsourcelab.com/shop/logic-analyzer/dslogic-plus/
http://www.qdkingst.com/en/products
http://my.bitscope.com/store/
https://www.scopefun.com/
http://www.opencircuits.com/Oscilloscope
Building an Amazing $10 Oscilloscope with an STM32 blue pill, LCD touchscreen, and STM32-O-Scope software
Same guy later edition(probably)
Constructing and experimenting with the STM32-O-Scope
The same idea
multiScope
Same guy(more details)
Fast, Portable and Affordable Oscilloscope and Inductance Meter
https://github.com/pingumacpenguin/STM32-O-Scope
https://github.com/pingumacpenguin/STM32-O-Scope/wiki
DSO Shell (DSO150) Oscilloscope DIY
https://hackaday.com/2017/11/18/ds212-oscilloscope-review-open-source-and-great-for-hacking/
OpenScope: Instrumentation for Everyone
An Oscilloscope Module for Novena
Simple AVR digital scope
use phone
http://www.electronics-lab.com/project/hs101-high-quality-cheap-diy-oscilloscope/
https://tomeko.net/miniscope_v2f/index.php?lang=en
https://github.com/abhishek-kakkar/BeagleLogic/wiki
https://standalone.beaglelogic.net/en/latest/prototypes.html