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OWASP Vicnum Project
From OWASP
Vicnum was introduced in 2009, Early releases introduced several vulnerable apps (and CTFs) including Guessnum, Jotto and the Union Challenge. Recent release upgrades are:
V1.5 (December 2013) Cyclone, a vulnerable Ruby on Rails Application
V1.6 (June 2014) Breaking Bad XXE Exploit
V1.7 (December 2015) Basic CTF to parse a pcap
V2.0 will be introduced in May 2016 and will include an intentionally vulnerable API.