Just spent 5 minutes making a script to find all the links in this thread and then 'score' them on the number of votes. Here's all the channels with 2 or more:

6 Votes: https://youtube.com/c/StuffMadeHere https://youtube.com/c/PracticalEngineeringChannel 5 Votes: https://youtube.com/c/AppliedScience https://youtube.com/c/smartereveryday https://youtube.com/c/3blue1brown https://youtube.com/c/numberphile 4 Votes: https://youtube.com/user/standupmaths 3 Votes: https://youtube.com/c/Nighthawkinlight https://youtube.com/c/pbsspacetime https://youtube.com/c/inanutshell https://youtube.com/c/AlphaPhoenixChannel https://youtube.com/user/Computerphile https://youtube.com/c/FoldingIdeas https://youtube.com/user/Nerdwriter1 https://youtube.com/c/Mathologer https://youtube.com/c/K%C3%A1rolyZsolnai https://youtube.com/c/UndecidedMF https://youtube.com/c/lockpickinglawyer https://youtube.com/c/RealEngineering https://youtube.com/c/academyofideas https://youtube.com/user/sixtysymbols 2 Votes: https://youtube.com/c/CNLohr https://youtube.com/c/PhilS94 https://youtube.com/c/Wendoverproductions https://youtube.com/c/SteveMould https://youtube.com/c/styropyro https://youtube.com/c/EevblogDave https://youtube.com/c/GreatArtExplained https://youtube.com/c/thephilosophytube https://youtube.com/c/ContraPoints https://youtube.com/c/patrickhwillems https://youtube.com/c/everyframeapainting https://youtube.com/c/LessonsfromtheScreenplay https://youtube.com/c/ArvinAsh https://youtube.com/watch?v=YuIIjLr6vUA https://youtube.com/channel/UCFaYLR_1aryjfB7hLrKGRaQ https://youtube.com/c/lexfridman https://youtube.com/c/keenancrane https://youtube.com/c/ScienceClicEN https://youtube.com/c/QuantaScienceChannel https://youtube.com/c/MentourPilotaviation https://youtube.com/c/Aleph0 https://youtube.com/c/AndreasSpiess https://youtube.com/c/Bigclive https://youtube.com/c/EconomicsExplained https://youtube.com/c/ZackFreedman https://youtube.com/c/whatdamath https://youtube.com/c/TimeGhost https://youtube.com/c/HuygensOptics https://youtube.com/c/MarcoReps https://youtube.com/c/AdamNeely https://youtube.com/c/TechIngredients https://youtube.com/c/CoolWorldsLab https://youtube.com/c/BPSspace https://youtube.com/c/CrackingTheCryptic https://youtube.com/c/mitocw https://youtube.com/c/EverydayAstronaut https://youtube.com/c/CaspianReport https://youtube.com/c/theschooloflifetv https://youtube.com/c/fermilab https://youtube.com/c/Eigensteve https://youtube.com/c/LOOKMUMNOCOMPUTER https://youtube.com/c/loopop https://youtube.com/c/MrCarlsonsLab https://youtube.com/greymatter https://youtube.com/c/CaptainDisillusion https://youtube.com/user/aragusea https://youtube.com/c/scishowspace https://youtube.com/c/engineerguyvideo https://youtube.com/c/DomainofScience https://youtube.com/user/DeepSkyVideos