Milan Dinić

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This plugin adds a menu in admin bar that enables toggling of activation status of plugins. It can be helpful to developers who want to quickly see something before and after plugin is activated.
Note that it has no settings, just activate it and it works immediately for any user that has permission to activate/deactivate plugins. Also note that it is not multisite compatible.
And it’s on <a href="https://github.com/dimadin/admin-bar-plugin-switcher" rel="nofollow ugc">GitHub</a>.

Admin Bar Plugin Switcher

Activate/deactivate plugins from admin bar.

edik

Deactivates emailing. WordPress sends no more mails.
How does it work?
<ul>
<li>It replaces ‘wp_mail’ with a dummy function</li>
</ul>
It doesn’t work?
<ul>
<li>Check for other plugins which replace ‘wp_mail’</li>
<li>Check for plugins which use ‘mail’ instead of ‘wp_mail’. And delete them! 😀</li>
</ul>

Mail Deactivation

Deactivates emailing. WordPress sends no more mails.

Admin Bar Plugin Switcher vs Mail Deactivation