|[SANS Cyber Aces](http://www.cyberaces.org/courses/)|SANS Cyber Aces Online makes available, free and online, selected courses from the professional development curriculum offered by The SANS Institute, the global leader in cyber security training.|
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|[Scene One](http://21ltr.com/2012/06/19/21LTR-Scene-One-LiveCD/)|Scene One is a pen testing scenario liveCD made for a bit of fun and learning.|
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|[Scene One](https://www.vulnhub.com/entry/21ltr-scene-1,3/)|Scene One is a pen testing scenario liveCD made for a bit of fun and learning.|
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|[SEED Labs](http://www.cis.syr.edu/~wedu/seed/all_labs.html)|The SEED project has labs on Software, Network, Web, Mobile and System security and Cryptography labs.|
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|[SentinelTestbed](https://github.com/dobin/SentinelTestbed)|Vulnerable website. Used to test sentinel features.|