RobWords — Lots of trivia about English as well as some other languages, some focusing on etymology, others on alphabet and so on..
Tapakapa — Quick explainers, recently focusing on country flags (there should be a -logy word for flags knowledge, I don't remember) EDIT: vexillology, as a few people pointed out
Carefree Wandering — Philosophy; Religion: specifically Daoism and Confucianism; Media theory; Identity "technolgies", specifically the concept of "profilicity"
Unsolicited Advice — Philosophy explainers; more approachable and less academic than the previous one, I guess
Ben Eater — 8-bit CPU made on breadboard fame, hands on explainer of computer architecture, networking, electronics and so on
Patrick Boyle — On finance, mostly for entertainment purposes
LegalEagle — In-depth analysis and discussion on American law and reporting on recent prominent legal cases
TechAltar — "Analytical videos about tech companies"
rewboss — A Brit living in Germany, with some videos on recent events, local history, cultural tidbits from a personal perspective
PolyMatter — In depth analysis of almost random, yet important matters
Computerphile — Like Numberphile, but with computer scientists instead
LowSpecGamer — History of (home) computing with focus on gaming; I am most impressed with the story/lore of 6502, 8080, Z80, ARM CPUs, how they came about etc.
NativLang — Linguistics, going quite in-depth, yet remaining approachable for the rest of us
Reducible — Computer science explainers with high quality animation, reminiscent of 3blue1brown
Faultline — "Telling human stories through geography"
Explaining Computers — Operating systems and computer hardware, SBCs review, explainers
Ordered randomly.