Purdue Northwest Cybersecurity Activities: https://games.pnwcyber.com/
Cyber Threat Defender card-based game (like Magic: The Gathering, some cost for card decks but very high-quality stuff)
Code Combat online game
Turing Game - middle-high school games to learn coding and compete in national competitions
Flowlab Game Creator - block coding and simple game creation tool appropriate for late elementary/middle school and up
Capture The Flag online security exercises, games, and competitions
Wireshark free network analyzer tool (Windows/Mac)
Burp network analyzer tool (Java/Mac OS)
National Cybersecurity Training & Education Center: https://www.ncyte.net/
National Initiative for Cybersecurity Careers and Studies: https://niccs.cisa.gov/
https://www.nsa.gov/Press-Room/Cybersecurity-Advisories-Guidance/