Crucible
github.com/cmu-sei/crucible- Category
- Cybersecurity
- Rank
- No. 1307Tools index
- Pricing
- Open Source
- Platform
- web · desktop
- Type
- TOOL
- Builder
- cmu-sei
- GitHub
- 51 stars
- Latest release
- 07.16.2026-1
- Added
- Aug 16, 2026
About
Crucible is an open-source framework built on Angular and .NET Core for designing, deploying, and managing virtual environments used in cybersecurity training, exercises, and competitions. It provides modular applications for building lab topologies, running scenario-based events, scoring games, and reviewing incident data, and has powered large-scale US DoD cyber exercises since 2018.
What it can do
Run scenario-based training events and exercises
Exercise scenario → Running training event
Score cybersecurity competitions and games
Competition activity data → Scores
Review incident data from exercises
Incident data → Incident review
Why it made the leaderboard
Standing up a realistic cyber range normally means gluing together hypervisors, IaC, scoring, and access control by hand; Crucible ships all of those as coordinated, production-tested components. Useful for anyone running security training, red/blue exercises, or CTF-style competitions.
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