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Damn Vulnerable Web Application (DVWA) As the name suggests, this is a MySQL/PHP web application that is vulnerable. It is there as a teaching aid for web developers, educators and security professionals.
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Metasploitable This is a virtual machine that was intentionally made vulnerable. It runs on Ubuntu Linux and is designed to be hacked by metasploit and other known hacking tools.
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NATAS NATAS is a war game created by OverThewire. It is there to teach you the basics of server side web security.
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SlaveHack Another hack simulation game that asks you to defend a virtual PC against intruders while you try to hack other players in a time period.
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HackThisSite (HTS) This is a security website that boasts a large user base of 1.8 million plus. You can learn and attempt at various basic and advanced hacking challenges set in a legal environment.
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Mutillidae This is a free open source web application that allows the users to use hack a vulnerable web application and pen test it.
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National Institute of Building Sciences NIBS offers various cybersecurity workshops for owners and managers.