Add Custom WooCommerce Product tabs from http://www.phpgenious.com/2013/07/add-custom-tabs-for-product-in-woocommerce/

Custom WooCommerce Product tabs

/**
 * Process meta
 *
 * Processes the custom tab options when a post is saved
 */
function process_product_meta_custom_tab($post_id) {
	update_post_meta($post_id, 'custom_tab_enabled', (isset ($_POST['custom_tab_enabled']) && $_POST['custom_tab_enabled']) ? 'yes' : 'no');
	update_post_meta($post_id, 'custom_tab_title', $_POST['custom_tab_title']);
	update_post_meta($post_id, 'custom_tab_content', $_POST['custom_tab_content']);
}
add_action('woocommerce_process_product_meta', 'process_product_meta_custom_tab', 10, 2);

/**
 * Display Tab
 *
 * Display Custom Tab on Frontend of Website for WooCommerce 2.0
 */
add_filter('woocommerce_product_tabs', 'woocommerce_product_custom_tab');

function woocommerce_product_custom_tab($tabs) {
	global $post, $product;
	$custom_tab_options = array (
		'enabled' => get_post_meta($post->ID,
		'custom_tab_enabled',
		true
	), 'title' => get_post_meta($post->ID, 'custom_tab_title', true), 'content' => get_post_meta($post->ID, 'custom_tab_content', true),);

	if ($custom_tab_options['enabled'] != 'no') {
		$tabs['custom-tab-first'] = array (
			'title' => $custom_tab_options['title'],
			'priority' => 45,
			'callback' => 'custom_product_tabs_panel_content',
			'content' => $custom_tab_options['content']
		);
	}
	return $tabs;
}

/**
 * Render the custom product tab panel content for the callback 'custom_product_tabs_panel_content'
 */
function custom_product_tabs_panel_content($key, $custom_tab_options) {
	echo '<h2>' . $custom_tab_options['title'] . '</h2>';
	echo $custom_tab_options['content'];

}

function custom_tab_options_tab_spec() {
?>
	<li class="custom_tab3"><a href="#custom_tab_data3"><?php _e('Technical Information', 'woothemes'); ?></a></li>
<?php

}
add_action('woocommerce_product_write_panel_tabs', 'custom_tab_options_tab_spec');

/**
 * Custom Tab Options
 *
 * Provides the input fields and add/remove buttons for custom tabs on the single product page.
 */
function custom_tab_options_spec() {
	global $post;

	$custom_tab_options_spec = array (
		'titlec' => get_post_meta($post->ID,
		'custom_tab_title_spec',
		true
	), 'contentc' => get_post_meta($post->ID, 'custom_tab_content_spec', true),);
?>
        <div id="custom_tab_data3" class="panel woocommerce_options_panel">
                <div class="options_group">
                        <p class="form-field">
                                <?php woocommerce_wp_checkbox( array( 'id' => 'custom_tab_enabled_spec', 'label' => __('Enable Custom Tab?', 'woothemes'), 'description' => __('Enable this option to enable the custom tab on the frontend.', 'woothemes') ) ); ?>
                        </p>
                </div>

                <div class="options_group custom_tab_options">
                    <p class="form-field">
                            <label><?php _e('Custom Tab Title:', 'woothemes'); ?></label>
                            <input type="text" size="5" name="custom_tab_title_spec" value="<?php echo @$custom_tab_options_spec['titlec']; ?>" placeholder="<?php _e('Enter your custom tab title', 'woothemes'); ?>" />
                    </p>
                    <p class="form-field">
                        <?php _e('Custom Tab Content:', 'woothemes'); ?>
                	</p>
                	<table class="form-table">
                    	<tr>
                        	<td>
<?php

	$settings = array (
		'text_area_name' => 'custom_tab_content_spec',
		'quicktags' => true,
		'tinymce' => true,
		'media_butons' => false,
		'textarea_rows' => 98,
		'editor_class' => 'contra',
		'editor_css' => '<style>#wp-custom_tab_content_spec-editor-container .wp-editor-area{height:250px; width:100%;} #custom_tab_data3 .quicktags-toolbar input {width:auto;}</style>'
	);
	$id = 'custom_tab_content_spec';

	wp_editor($custom_tab_options_spec['contentc'], $id, $settings);
?>

                            </td>
                    </tr>
            </table>
        </div>
        </div>
<?php

}
add_action('woocommerce_product_write_panels', 'custom_tab_options_spec');

/*************/

function custom_tab_options_tab() {
?>
    <li class="custom_tab"><a href="#custom_tab_data"><?php _e('Contact Information', 'woothemes'); ?></a></li>
<?php

}
add_action('woocommerce_product_write_panel_tabs', 'custom_tab_options_tab');

/**
 * Custom Tab Options
 *
 * Provides the input fields and add/remove buttons for custom tabs on the single product page.
 */
function custom_tab_options() {
	global $post;

	$custom_tab_options = array (
		'title' => get_post_meta($post->ID,
		'custom_tab_title',
		true
	), 'content' => get_post_meta($post->ID, 'custom_tab_content', true),);
?>
    <div id="custom_tab_data" class="panel woocommerce_options_panel">
        <div class="options_group">
            <p class="form-field">
                    <?php woocommerce_wp_checkbox( array( 'id' => 'custom_tab_enabled', 'label' => __('Enable Custom Tab?', 'woothemes'), 'description' => __('Enable this option to enable the custom tab on the frontend.', 'woothemes') ) ); ?>
            </p>
        </div>

        <div class="options_group custom_tab_options">
            <p class="form-field">
                <label><?php _e('Custom Tab Title:', 'woothemes'); ?></label>
                <input type="text" size="5" name="custom_tab_title" value="<?php echo @$custom_tab_options['title']; ?>" placeholder="<?php _e('Enter your custom tab title', 'woothemes'); ?>" />
            </p>

            <p class="form-field">
               <?php _e('Custom Tab Content:', 'woothemes'); ?>
        	</p>
            <table class="form-table">
                <tr>
                    <td>
                     	<textarea class="theEditor" rows="3" cols="90" name="custom_tab_content" placeholder="<?php _e('Enter your custom tab content', 'woothemes'); ?>"><?php echo @$custom_tab_options['content']; ?></textarea>
                    </td>
                </tr>
            </table>
    	</div>
    </div>
<?php

}
add_action('woocommerce_product_write_panels', 'custom_tab_options');

/**
 * Process meta
 *
 * Processes the custom tab options when a post is saved
 */
function process_product_meta_custom_tab_spec($post_id) {
	update_post_meta($post_id, 'custom_tab_enabled_spec', (isset ($_POST['custom_tab_enabled_spec']) && $_POST['custom_tab_enabled_spec']) ? 'yes' : 'no');
	update_post_meta($post_id, 'custom_tab_title_spec', $_POST['custom_tab_title_spec']);
	update_post_meta($post_id, 'custom_tab_content_spec', $_POST['custom_tab_content_spec']);
}
add_action('woocommerce_process_product_meta', 'process_product_meta_custom_tab_spec', 10, 2);

/**
 * Display Tab
 *
 * Display Custom Tab on Frontend of Website for WooCommerce 2.0
 */

add_filter('woocommerce_product_tabs', 'woocommerce_product_custom_tab_spec');

function woocommerce_product_custom_tab_spec($tabs) {
	global $post, $product;

	$custom_tab_options_spec = array (
		'enabled' => get_post_meta($post->ID,
		'custom_tab_enabled_spec',
		true
	), 'titlec' => get_post_meta($post->ID, 'custom_tab_title_spec', true), 'contentc' => get_post_meta($post->ID, 'custom_tab_content_spec', true),);

	if ($custom_tab_options_spec['enabled'] != 'no') {
		$tabs['custom-tab-second'] = array (
			'title' => $custom_tab_options_spec['titlec'],
			'priority' => 30,
			'callback' => 'custom_product_tabs_panel_content_spec',
			'content' => $custom_tab_options_spec['contentc']
		);
	}
	return $tabs;
}

/**
 * Render the custom product tab panel content for the callback 'custom_product_tabs_panel_content_spec'
 */
function custom_product_tabs_panel_content_spec($key, $custom_tab_options_spec) {

	global $post, $product;

	$custom_tab_options_spec = array (
		'enabled' => get_post_meta($post->ID,
		'custom_tab_enabled_spec',
		true
	), 'titlec' => get_post_meta($post->ID, 'custom_tab_title_spec', true), 'contentc' => get_post_meta($post->ID, 'custom_tab_content_spec', true),);

	echo '<h2>' . $custom_tab_options_spec['titlec'] . '</h2>';
	echo $custom_tab_options_spec['contentc'];

}

function custom_tab_options_tab_down() {
?>
        <li class="custom_tab2"><a href="#custom_tab_data2"><?php _e('DIRECTIONS', 'woothemes'); ?></a></li>
<?php

}
add_action('woocommerce_product_write_panel_tabs', 'custom_tab_options_tab_down');

/**
 * Custom Tab Options
 *
 * Provides the input fields and add/remove buttons for custom tabs on the single product page.
 */
function custom_tab_options_down() {
	global $post;

	$custom_tab_options_down = array (
		'titleb' => get_post_meta($post->ID,
		'custom_tab_title_down',
		true
	), 'contentb' => get_post_meta($post->ID, 'custom_tab_content_down', true),);
?>
        <div id="custom_tab_data2" class="panel woocommerce_options_panel">
            <div class="options_group">
                <p class="form-field">
                    <?php woocommerce_wp_checkbox( array( 'id' => 'custom_tab_enabled_down', 'label' => __('Enable Custom Tab?', 'woothemes'), 'description' => __('Enable this option to enable the custom tab on the frontend.', 'woothemes') ) ); ?>
                </p>
            </div>

            <div class="options_group custom_tab_options">
                <p class="form-field">
                    <label><?php _e('Custom Tab Title:', 'woothemes'); ?></label>
                    <input type="text" size="5" name="custom_tab_title_down" value="<?php echo @$custom_tab_options_down['titleb']; ?>" placeholder="<?php _e('Enter your custom tab title', 'woothemes'); ?>" />
                </p>
            	<p class="form-field">
                	<?php _e('Custom Tab Content:', 'woothemes'); ?>
            	</p>

	            <table class="form-table">
	                <tr>
	                    <td>
	                        <textarea class="theEditor" rows="3" cols="90" name="custom_tab_content_down" placeholder="<?php _e('Enter your custom tab content', 'woothemes'); ?>"><?php echo @$custom_tab_options_down['contentb']; ?></textarea>
	                    </td>
	                </tr>
	            </table>
	        </div>
        </div>
<?php

}
add_action('woocommerce_product_write_panels', 'custom_tab_options_down');

/**
 * Process meta
 *
 * Processes the custom tab options when a post is saved
 */
function process_product_meta_custom_tab_down($post_id) {
	update_post_meta($post_id, 'custom_tab_enabled_down', (isset ($_POST['custom_tab_enabled_down']) && $_POST['custom_tab_enabled_down']) ? 'yes' : 'no');
	update_post_meta($post_id, 'custom_tab_title_down', $_POST['custom_tab_title_down']);
	update_post_meta($post_id, 'custom_tab_content_down', $_POST['custom_tab_content_down']);
}
add_action('woocommerce_process_product_meta', 'process_product_meta_custom_tab_down', 10, 2);

/**
 * Display Tab
 *
 * Display Custom Tab on Frontend of Website for WooCommerce 2.0
 */

add_filter('woocommerce_product_tabs', 'woocommerce_product_custom_tab_down');

function woocommerce_product_custom_tab_down($tabs) {
	global $post, $product;

	$custom_tab_options_down = array (
		'enabled' => get_post_meta($post->ID,
		'custom_tab_enabled_down',
		true
	), 'titleb' => get_post_meta($post->ID, 'custom_tab_title_down', true), 'contentb' => get_post_meta($post->ID, 'custom_tab_content_down', true),);

	if ($custom_tab_options_down['enabled'] != 'no') {
		$tabs['custom-tab-third'] = array (
			'title' => $custom_tab_options_down['titleb'],
			'id' => 'test_multicheckbox',
			'priority' => 35,
			'callback' => 'custom_product_tabs_panel_content_down',
			'content' => $custom_tab_options_down['contentb']
		);
	}

	return $tabs;
}

/**
 * Render the custom product tab panel content for the callback 'custom_product_tabs_panel_content_down'
 */
function custom_product_tabs_panel_content_down($key, $custom_tab_options_down) {
	global $post, $product;

	$custom_tab_options_down = array (
		'enabled' => get_post_meta($post->ID,
		'custom_tab_enabled_down',
		true
	), 'titleb' => get_post_meta($post->ID, 'custom_tab_title_down', true), 'contentb' => get_post_meta($post->ID, 'custom_tab_content_down', true),);

	$downloads = get_post_meta($post->ID, 'custom_tab_content_down', true);
	$nsoutput = do_shortcode($downloads);

	echo '<h2>' . $custom_tab_options_down['titleb'] . '</h2>';
	print $nsoutput;
}