If you find some security-relevant bug please rather direct your mails at ~firstname.lastname@example.org to make sure that they are not publicly visible until they are fixed.
To find out how to contribute, please see this page. Bug-Reports and Feature-Requests may be filed here.
If you feel like it, you can donate.
Unless stated otherwise the texts of this website are released under CC-BY and code-snippets under the GPL.
© Moritz Poldrack