Sometimes we just don’t need to see the standard widgets that come packaged in WordPress.
Here’s how to get rid of them
function unregister_default_wp_widgets() {
unregister_widget('WP_Widget_Pages');
unregister_widget('WP_Widget_Calendar');
unregister_widget('WP_Widget_Links');
unregister_widget('WP_Widget_Meta');
unregister_widget('WP_Widget_Archives');
unregister_widget('WP_Widget_Search');
unregister_widget('WP_Widget_Recent_Posts');
unregister_widget('WP_Widget_Categories');
unregister_widget('WP_Widget_Recent_Comments');
unregister_widget('WP_Widget_RSS');
unregister_widget('WP_Widget_Text');
unregister_widget('WP_Widget_Tag_Cloud');
}
add_action('widgets_init', 'unregister_default_wp_widgets', 1);