Archive for custom fields?

WordPress does not support by default custom_fields archive like for taxonomies (yeah, taxonomies can have categories) but we can create a destination page with page template (linked from the listed custom_field) and added a searching on the custom_field, like this (from the listing page):

<?php
if (get_post_meta($post->ID,'_my_meta',TRUE)) :
    $key_meta = get_post_meta($post->ID,'_my_meta',TRUE);
endif;
?>
<a href="https://wordpress.stackexchange.com/questions/92473/<?php bloginfo("url'); ?>/?s=<?php echo $key_meta[meta_field]; ?>"><?php echo $key_meta[meta_field]; ?></a>

The destination page’s layout we can customize by preferences.