Big picture science:

• Practical Engineering – civil engineering mostly. Lots of physical models and experiments. Complex topics explained in a simple and accessible way.
• Climate Town – climate change / corporate greed and manipulation presented in an accessible and fun way. Well researched.
• Not Just Bikes – sustainable city planning, smart transportation design patterns and anti-patterns. Lots of real world examples.
• Wendover Productions – mostly economics-related topics covered in great detail. Well researched and insightful.
• JayForeman – mostly London’s history based around maps. Wacky, fun and insightful.

Every-day science:

• Technology connections – home appliances and simple (one might think) devices explained in great detail.
• Steve Mould – home made experiments explaining interesting concepts.
• SmarterEveryDay – scientific look at all sorts of random things.
• Olaf Willocx – rocketry theory. Because why not?

Lectures:

• CrashCourse – quick and accessible courses on multiple topics.
• Gresham Collage – free lectures on a broad set of topics.
• George C. Marshall Foundation – military history related lectures.

History and historical stuff:

• Forgotten Weapons – one-man gun encyclopedia sharing his knowledge and experience with modern and historical guns.
• Tod’s Workshop – medieval weapons and armour, crafted using period-appropriate techniques and tested in the field!
• Defunctland – interesting stories of failed theme-parks, Disneyland attractions etc.

Retro gaming and hardware:

• LGR – retro gaming and computer parts. Testing stuff you dreamt of having as a kid.
• Techmoan – all sorts of retro audio/visual devices and gadgets.
• Nostalgia Nerd – mostly retro-hardware. Not as in-depth as LGR but still interesting.
• The 8-Bit Guy – as the name suggests, lots of Atari/Commodore related stuff.

Tech:

• Computerphile – a bunch of college teachers explaining complex IT concepts in an easy to grasp manner.
• AddOhms – electronics tutorials for everyone.

DIY:

• GreatScott! – electronics related projects and reviews.
• Stuff Made Here – funny and clever projects, from design to execution. DIY if you have money for all those machines.

Cars:

• Driving 4 answers – all basic and advanced car topics explained in an extremely accessible way. All you need to see to know how everything in your car works.
• High-Performance Academy – nuts and bolts and bits and transistors of race car design.
• Ed’s Auto Reviews – automotive history videos. Lots of historical footage.

Memes and internet fun:

• Internet Historian – most memetic world events presented using memes. Wacky and fun.

Not necessarily educational:

• Red Letter Media – An institution of a channel. Huge amounts of knowledge and inside jokes. Mature and open-minded approach to cinema.
• Videogamedunkey – a game reviewer/comedian. Creates game reviews/comedies. Each one a masterpiece in its own right.
• Crowbcat – in depth looks at important gaming events, like failures of major game studios.