Free
OWASP Foundation
Nonprofit hub for free application security projects and standards
Security LearningOpen web security community
Alternatives to OWASP Cheat Sheet Series
12 tools like OWASP Cheat Sheet Series, chosen by what they do. About OWASP Cheat Sheet Series
Open source
OWASP Juice Shop
Deliberately insecure web app for security training and CTFs
Security LearningDeliberately insecure web app
Free
Web Security Academy
Free online web security training with interactive labs
Security LearningFree web security training
Freemium
TryHackMe
Browser-based hands-on cyber security labs and guided paths
Security LearningGuided cyber security rooms
Curated
Hack The Box
Hands-on cyber labs, challenges and training for teams and learners
Security LearningHands on hacking labs
Curated
Devhints
Short developer cheat sheets for languages, libraries and tools
Cheat SheetsDeveloper cheat sheets
Open source
QuickRef.ME
Developer cheat sheets for languages, tools and shortcuts
Cheat SheetsQuick reference cheat sheets
Curated
Wiz
Cloud and AI security platform linking code, cloud and runtime
Cloud SecurityCloud security platform
Open source
OWASP Coraza
Go-based open source web application firewall with CRS support
Network DefenseGo web application firewall
Open source
Sigstore
Open source tools for signing and verifying software artifacts
Cloud SecuritySign and verify software