Cool Worlds (Similar to PBSSpace time, but very good at statistical analysis and modeling, narrator is very calming),
https://youtube.com/c/CoolWorldsLab
Music Theory, Music Electronics, and Synthesizers:
Benn Jordan (General music topics, he has a good scientific mind and electronics skills that he shows off sometimes),
https://youtube.com/c/BennandGear
Two-mimute papers (Very fast and exuberant machine learning research summaries, hold on to your papers fellow scholars!),
https://youtube.com/c/K%C3%A1rolyZsolnai
Electronics:
Great Scott! (Electronics projects and components), https://youtube.com/c/greatscottlab
Modern Vintage Gamer (Gaming electronics, gaming history, firmware, and reverse engineering topics), https://youtube.com/c/ModernVintageGamer
Mr. Carson's Lab (Electronics restoration, especially old radios, he has an insane lab), https://youtube.com/c/MrCarlsonsLab
Astronomy:
Cool Worlds (Similar to PBSSpace time, but very good at statistical analysis and modeling, narrator is very calming), https://youtube.com/c/CoolWorldsLab
DeepSkyVideos (Catalog of videos explaining different objects of note in astronomy), https://youtube.com/user/DeepSkyVideos
SciShowSpace (Bite-sized space videos), https://youtube.com/c/scishowspace
General Science and Engineering:
Undecided with Matt Ferrell (Covers topics that are bleeding edge), https://youtube.com/c/UndecidedMF
Engineer Guy (Random engineering topics with a few much longer detailed lectures and audio book reads), https://youtube.com/c/engineerguyvideo
Casual Navigation (Maritime explanation videos), https://youtube.com/c/CasualNavigation
Microcosmos (Huge selection of microbial life videos) https://youtube.com/c/microcosmos
Curious Droid (General science and engineering explanations), https://youtube.com/c/CuriousDroid
Braniac75 (Amateur science experiments, lasers, and random science topics), https://youtube.com/c/brainiac75
Cody's Lab (Mostly backyard chemistry, but often times has other science experiments), https://youtube.com/user/theCodyReeder
Seeker (Well produced mini science documentaries and science news), https://youtube.com/c/Seeker
Quanta Magazine (similar to Seeker), https://youtube.com/c/QuantaScienceChannel
New Mind (Similar to Seeker and Quanta Magazine), https://youtube.com/c/NewMind
Periodic Videos (Chemistry and elements), https://youtube.com/user/periodicvideos
Fermilab (Easily digestible particle physics), https://youtube.com/c/fermilab
Nils Berglund (Library of particle and wave simulations), https://youtube.com/c/NilsBerglund
Royal Institution (Huge catolog of science speeches at the Royal Institution), https://youtube.com/c/TheRoyalInstitution
Ordanance Lab (Explosives science and explosives testing videos), https://youtube.com/c/OrdnanceLab
Domain of Science (Quantum physics, and he also makes knowldge maps in different science and math disciplines), https://youtube.com/c/DomainofScience
Alpha Phoenix (Science experiments and materials science), https://youtube.com/c/AlphaPhoenixChannel
Breaking Taps (DIY materials science) https://youtube.com/c/BreakingTaps
Mentour Pilot (Aircraft Accident Investigations), https://youtube.com/c/MentourPilotaviation
Music Theory, Music Electronics, and Synthesizers:
Benn Jordan (General music topics, he has a good scientific mind and electronics skills that he shows off sometimes), https://youtube.com/c/BennandGear
Adam Neely (Advanced music theory and random music topics), https://youtube.com/c/AdamNeely
Look Mum No Computer (Music experiments with analog electronics), https://youtube.com/c/LOOKMUMNOCOMPUTER
Andrew Huang (Random music tech reviews, basic theory, and music production), https://youtube.com/c/andrewhuang
loopop (The most thorough and comprehensive music electronics feature overviews), https://youtube.com/c/loopop
Rick Beato (Music production and music industry analysis), https://youtube.com/c/RickBeato
Tantacrul (Music Software design, he works on Audacity), https://youtube.com/c/Tantacrul
Math and Computer Science:
Zach Starr (Math and computer science topics), https://youtube.com/c/zachstar
Numberphile (General math concepts), https://youtube.com/c/numberphile
Stand-up Maths (General math topics, but goes into more detail than Numberphile), https://youtube.com/user/standupmaths
Mathologer (General math concepts), https://youtube.com/c/Mathologer
Steve Yegge (Computer science and software industry), https://youtube.com/user/SteveYegge
Low Level Learning (Computer science, but the lower levels), https://youtube.com/c/LowLevelLearning
DEFCONConference (Huge selection of hacking-related talks), https://youtube.com/user/DEFCONConference
Strange Loop Conference (Software conference videos), https://youtube.com/c/StrangeLoopConf
Two-mimute papers (Very fast and exuberant machine learning research summaries, hold on to your papers fellow scholars!), https://youtube.com/c/K%C3%A1rolyZsolnai
Video Editing and Special Effects:
Captain Disillusion (Debunks fake videos with image analysis, and creates walkthroughs of how it's done), https://youtube.com/c/CaptainDisillusion
Edit, I almost forgot Adam Ragusea, he does excellent science-based cooking videos, https://youtube.com/user/aragusea