These are other math programs I am aware of or am fond of and would highly recommend. If you are looking for college math courses or extracurricular math topics not found on math competitions and school math, feel free to look into these.
College/graduate level math year-round:
High School Summer Camps:
Canada/USA Mathcamp – get to explore a range of topics, great culture
HCSSiM get to explore a range of topics, great culture
Ross – number theory for first year’s
PROMYS – Number theory for first year’s
Mathily – discrete math topics/exploration
AwesomeMath – competition math, now held online.
See here for more details
Middle School Math Camps:
MathPath – explore a range of topics, great culture
Olympiad math training programs:
OTIS – self study program for olympiad math (highly recommend)
WOOT – AoPS’s olympiad prep program.
Intro Math Competition Prep:
TheBeautyofMath – a program similar to mine, introductory classes and AMC 8/10/12 prep.
Extracurricular Math Videos:
3blue1brown (highly recommended) – Grant has great visual animations and great explanations for a variety of topics.
Twitch Solves ISL: Olympiad problem live solves – Evan Chen live solves olympiad math problems with help from twitch chat.
The Beauty of Math– James has great videos on math competition prep advice and solutions videos for past AMC problems.
The Math Sorcerer– Helpful advice for those getting started with college math, as well as studying mindset/mentality
SoME (Summer of Math Exposition) – videos made for Grant Sanderson’s (3blue1brown’s) math exposition contest – many great videos
I am also a fan of Richard Borcherd’s youtube videos, as well as Timothy Gower’s.
Olympiad math and Putnam prep:
Poh Shen Loh (Putnam) (Olympiad)
Yufei Zhao (Putnam) (Olympiad)
Annoying Precision – Qiaochu Yuan – great exposition on high level math topics
Learning math (Evan Chen)
Expository papers on undergrad math topics (Keith Conrad)