Really depends on what you want to check out. Here are some of my favorites in no particular order but roughly ordered by topic.
Science
- Astrum - various space and planets related topics
- Geschichtsfenster - A German channel on medieval topics and reactions to documentaries
- Raumzeit - Vlog der Zukunft - A German channel about space and science
- Urknall, Weltall und das Leben - A German science channel with focus on space topics
Technology
- Cathode Ray Dude - In-detail videos on 2000's tech with focus on audio/video hardware
- Lost In Tech - Videos on 3D printing and 3D printers
- my mechanics - High quality "restoration ASMR"
- The 8-Bit Guy - Videos about 1980's computer technology
- Brodie Robertson - News and commentary on various Linux and FOSS topics
- ThePrimeagen - Reactions on various coding-related content
- Kevin Powell - CSS tutorials and videos on CSS development
- Zack Freedman - Could be best described as "open source craftmanship"
Gaming
- aCookieGod - Minecraft mega builds in hardcore mode
- Fan The Deck - Steam Deck news and commentary
- Karl Jobst - Documentations on gaming history and speedruns
- Shulkercraft - Minecraft videos about creative and large build projects
- Summoning Salt - Video games speedrun history and documentation
3D printing
- 3D Printing Nerd - A channel about 3D printing topics
- CNC Kitchen - Mainly 3D printing content