Doing free security audits for extending my project list

I have some spare time the next weeks and want to extend my list of references of security projects. Therefore I am looking for projects that want me to test their application / web-application for free. The audits will be short projects with 1 or 2 days of testing.

I would prefer white-box tests or open source applications and will be doing automated and manual testing. Black-box is also acceptable if a testing environment is provided. Found issues will be explained and the terms of disclosure can be discussed.

You can contact me at mail@devko.de