In reply to Brian Fuller.

While the public facing wordpress repository listings have been removed, the plugins haven't been removed from the actual subversion repository.

You can still access the old versions via
https://plugins.svn.wordpress.org/si-captcha-for-wordpress/
https://plugins.svn.wordpress.org/si-contact-form/
https://plugins.svn.wordpress.org/fast-secure-recaptcha/
https://plugins.svn.wordpress.org/visitor-maps/

You'll need to go to "tags" and pick the version BEFORE the rogue code was inserted.