Well, if you wanna play with those low-level findings tools, you could look at the http://samate.nist.gov/SRD test cases...
Just be aware that those do not represent real applications, it's too much synthetic.
Otherwise, go to CVE, pick a project, not too big, with lots of vulns, and run the tools on it... you can then correlate results from tools (weaknesses) with vulns.
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