A gist based on repeater fields as seen https://gist.github.com/da1nonly/2057532 by da1nonly with added wordpress post link ability using wpLink by modifying this answer http://wordpress.stackexchange.com/questions/127088/how-can-i-use-the-built-in-wordpress-browse-link-functionality/135843#135843

add-pages-post-metabox.php

<?php

add_action('admin_init', 'add_meta_boxes', 1);

function add_meta_boxes() {
	add_meta_box( 'repeatable-fields', esc_html__('Related Articles', 'mytheme'), 'my_related_articles_meta_box_display', 'post', 'normal', 'high');
}


function my_related_articles_meta_box_display() {
	global $post;
	$repeatable_fields = get_post_meta($post->ID, 'repeatable_fields', true);
	wp_nonce_field( 'repeatable_meta_box_nonce', 'repeatable_meta_box_nonce' );
?>
	<script type="text/javascript">
	jQuery(document).ready(function($) {
		'use strict';
		$('#add-row').on('click', function() {
			var row = $('.empty-row.screen-reader-text').clone(true);
			row.removeClass('empty-row screen-reader-text');
			row.insertBefore('#repeatable-fieldset-one tbody>tr:last');
			return false;
		});

		$('.remove-row').on('click', function() {
			$(this).parents('tr').remove();
			return false;
		});

		$('#repeatable-fieldset-one tbody').sortable({
			opacity: 0.6,
			revert: true,
			cursor: 'move',
			handle: '.sort'
		});


		var _link_sideload = false; //used to track whether or not the link dialogue actually existed on this page, ie was wp_editor invoked.

		var link_btn = (function($){
			'use strict';

			var _link_sideload = false; //used to track whether or not the link dialogue actually existed on this page, ie was wp_editor invoked.

			/* PRIVATE METHODS
			-------------------------------------------------------------- */
			//add event listeners

			function _init() {
			    $('body').on('click', '#add-link', function(event) {
			    	function add_empty_row() {
						var row = $('.empty-row.screen-reader-text').clone(true);
						row.removeClass('empty-row screen-reader-text');
						row.insertBefore('#repeatable-fieldset-one tbody>tr:last');
						return false;
					}

					if ( !$('#repeatable-fieldset-one tbody').find('tr:first-of-type').hasClass('empty-row screen-reader-text') ) {
						if ($('#repeatable-fieldset-one tbody').find('tr:first-of-type input[name="article_name[]"]').val() !== '') {
							add_empty_row();
						}
					} else{
						add_empty_row();
					}


			        _addLinkListeners();
			        _link_sideload = false;

			        if ( typeof wpActiveEditor != 'undefined') {
			            wpLink.open();
			        } else {
			            window.wpActiveEditor = true;
			            _link_sideload = true;
			            wpLink.open();
			        }
			        return false;
			    });
			}

			/* LINK EDITOR EVENT HACKS
			-------------------------------------------------------------- */
			function _addLinkListeners() {
			    $('body').on('click', '#wp-link-submit', function(event) {
			        var linkAtts = wpLink.getAttrs();
			        var link_val_container = $('.article_link').eq(-2);
			        var name_val_container = $('.article_name').eq(-2);
			        var link_text = $('#wp-link-text').val();

			        link_val_container.val(linkAtts.href);
			        name_val_container.val(link_text);

					var $frame = $('#content_ifr'),
					$added_links = $frame.contents().find("a[data-mce-href]");

					$added_links.each(function(){
						if ($(this).attr('href') === linkAtts.href) {
							$(this).remove();
						}
					});

			        wpLink.textarea = $('body');
			        _removeLinkListeners();
			        return false;
			    });

			    $('body').on('click', '#most-recent-results ul li', function(event){
			    	var item_title = $(this).find('.item-title').text();
			    	$('#wp-link-text').val(item_title);
			    });

			    $('body').on('click', '#wp-link-cancel', function(event) {
			        function remove_empty_row() {
						$('#repeatable-fieldset-one tbody>tr:eq(-2)').remove();
						return false;
					}
					remove_empty_row();
			        _removeLinkListeners();
			        return false;
			    });
			}

			function _removeLinkListeners() {
			    if(_link_sideload){
			        if ( typeof wpActiveEditor != 'undefined') {
			            wpActiveEditor = undefined;
			        }
			    }

			    wpLink.close();

			    $('body').off('click', '#wp-link-submit');
			    $('body').off('click', '#wp-link-cancel');
			}

			/* PUBLIC ACCESSOR METHODS
			-------------------------------------------------------------- */
			return {
			    init: _init,
			};

		})(jQuery);

		// Initialize
		link_btn.init();
	});
	</script>
	<style type="text/css">
	#repeatable-fieldset-one .icons{
		font: 400 20px/1 dashicons;
		speak: none;
		display: inline-block;
		padding: 0 2px 0 0;
		top: 0;
		left: -1px;
		position: relative;
		vertical-align: top;
		-webkit-font-smoothing: antialiased;
		-moz-osx-font-smoothing: grayscale;
		text-decoration: none!important;
		cursor: move;
		cursor: grab;
		cursor: -moz-grab;
		cursor: -webkit-grab;
	}
	#repeatable-fieldset-one .icons:active{
		cursor: grabbing;
		cursor: -moz-grabbing;
		cursor: -webkit-grabbing;
	}
	#repeatable-fieldset-one a .icons{
		color: #0073aa;
	}
	#repeatable-fieldset-one a:hover .icons{
		color: #0073aa;
	}
	#repeatable-fieldset-one .icons .dashicons-menu:before{
		content: "\f333";
	}
	</style>

	<table id="repeatable-fieldset-one" width="100%">
	<thead>
		<tr>
			<th width="40%"><?php esc_html__('Article Name', 'mytheme'); ?></th>
			<th width="50%"><?php esc_html__('URL', 'mytheme'); ?></th>
			<th width="2%"></th>
			<th width="2%"></th>
		</tr>
	</thead>
		<tbody>
		<?php
		if ( $repeatable_fields ) :
			foreach ( $repeatable_fields as $field ) {
		?>
			<tr>
				<td><input type="text" class="widefat article_name" name="article_name[]" value="<?php if($field['article_name'] != '') echo esc_attr( $field['article_name'] ); ?>" /></td>

				<td><input type="text" class="widefat article_link" name="url[]" value="<?php if ($field['url'] != '') echo esc_attr( $field['url'] ); else echo 'http://'; ?>" /></td>
				<td><a class="button remove-row" href="#">-</a></td>
				<td><a class="sort"><i class="icons dashicons-menu"></i></a></td>

			</tr>
		<?php
			}
		else :
		?>
			<tr>
				<td><input type="text" class="widefat article_name" name="article_name[]" /></td>
				<td><input type="text" class="widefat article_link" name="url[]" value="http://" /></td>
				<td><a class="button remove-row" href="#">-</a></td>
				<td><a class="sort"><i class="icons dashicons-menu"></i></a></td>
			</tr>
		<?php endif; ?>
			<tr class="empty-row screen-reader-text">
				<td><input type="text" class="widefat article_name" name="article_name[]" /></td>
				<td><input type="text" class="widefat article_link" name="url[]" value="http://" /></td>
				<td><a class="button remove-row" href="#">-</a></td>
				<td><a class="sort"><i class="icons dashicons-menu"></i></a></td>
			</tr>
		</tbody>
	</table>

	<p><a id="add-row" class="button" href="#"><?php esc_html_e('Add another', 'mytheme'); ?></a>
	<p><a id="add-link" class=".link-btn button" href="#"><?php esc_html_e('Add posts', 'mytheme'); ?></a>
	</p>

	<?php
}

add_action('save_post', 'my_related_articles_meta_box_save');

function my_related_articles_meta_box_save($post_id) {
	if ( ! isset( $_POST['repeatable_meta_box_nonce'] ) ||
		! wp_verify_nonce( $_POST['repeatable_meta_box_nonce'], 'repeatable_meta_box_nonce' ) )
		return;
	if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE)
		return;
	if (!current_user_can('edit_post', $post_id))
		return;
	$old = get_post_meta($post_id, 'repeatable_fields', true);
	$new = array();
	$names = $_POST['article_name'];
	$urls = $_POST['url'];
	$count = count( $names );
	for ( $i = 0; $i < $count; $i++ ) {
		if ( $names[$i] != '' ) :
			$new[$i]['article_name'] = stripslashes( strip_tags( $names[$i] ) );
		if ( $urls[$i] == 'http://' )
			$new[$i]['url'] = '';
		else
			$new[$i]['url'] = stripslashes( $urls[$i] ); // and however you want to sanitize
		endif;
	}
	if ( !empty( $new ) && $new != $old )
		update_post_meta( $post_id, 'repeatable_fields', $new );
	elseif ( empty($new) && $old )
		delete_post_meta( $post_id, 'repeatable_fields', $old );
}