rsd_link(), wlwmanifest_link(), wp_generator() are bunch of WordPress default filters that clutter the <head></head> section of your Theme’s template header.php file:
<head> ... <link rel="EditURI" type="application/rsd xml" title="RSD" href="http://.../xmlrpc.php?rsd" /> <link rel="wlwmanifest" type="application/wlwmanifest xml" href="http://.../wp-includes/wlwmanifest.xml" /> <meta name="generator" content="WordPress/..." /> ... </head>
Remove rsd_link() and / or wlwmanifest_link()
You can remove clutter of unused rsd_link() (Really Simple Discovery) or wlwmanifest_link() (Windows Live Writer) by adding the following to your Theme’s template functions.php file:
remove_action('wp_head', 'rsd_link');
remove_action('wp_head', 'wlwmanifest_link');
wp_generator()
wp_generator() filter hooks the generator META tag to wp_head() which outputs:
<meta name="generator" content="WordPress/..." />
Besides the <head></head> section of your theme template file, it also adds in RSS, ATOM and etc.
To remove it, just add the following to your Theme’s template functions.php file:
add_filter('the_generator', create_function('', 'return "";'));
Now, that really clears my HEAD.