Most of my favourites have already been mentioned but here's a few that I haven't seen:

• Chris Spargo - Documentarian 'Answering life's little questions' (in his own words)

• HowTown - Well researched, slick documentaries on science and sociology

• Useful charts - Family trees and history combined with some nuanced religious history

• Map Men - Somehow both an incredible geography channel and very funny skit show

• ToldInStone - Regular and endlessly fascinating ancient history content

• Captain Disillusionment - A one man special effects genius makes funny deep dives and debunks on special effects topics

• Nile Red - Chemistry wiz kid makes alcohol from toilet paper - The closest thing to a modern alchemist I can imagine

• Joel haver - Inventor the rotoscoped paint cartoon, funny, creatively driven and refuses to sell out

• Patrick Boyle - Educated, nuanced and cuttingly dry humoured takes on popular economics issues

• Steve Mould - High quality science demos and explanations with an engaging and humble host