WeHackPurple - Online courses that teach application security theory and hands-on technical lessons
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Presentations, training modules, and other education materials from Duo Security's Application Security team.
Variety of VM and online challenges (paid)
Secure Code Warrior - Gamified and hands-on secure development training with support for courses, assessments and tournaments
Pager Duty - A presentation created and open-sourced by PagerDuty to provide security training to software engineers