Security

Allows you to delegate your URL as an OpenID. This prevents your from having to run your own OpenID server while allowing you to harness your site as an OpenID. If you switch OpenID Providers, just switch your settings in the module. This means you can log into sites using your site's address as the OpenID login.

This is a sysadmin & developer tool that adds extensive tracing facilities for Drupal hook invocations, database queries and PHP errors.

For an introduction, read the original blog post at:
http://ar.to/2006/12/easier-drupal-debugging-with-trace

The Persistent Login module provides a "Remember Me" option on the user login form. Persistent Login is independent of the session lifetime configuration and provides additional security than setting a long session lifetime by refreshing tokens on each use and detecting the reuse of previously valid tokens.

This module supports enforcing restrictions on user passwords by defining password policies.

Announcement: There is no good server-side solution for this problem in Drupal 5 or Drupal 6.