<?php if(is_front_page()){?>
    <h1>Blog Directory</h1>
 
<?php
    global $wpdb;
    $query = "SELECT blog_id FROM " . $wpdb->base_prefix . "blogs WHERE spam != '1' AND archived != '1' AND deleted != '1' AND public = '1' AND blog_id != '1' ORDER BY path";
    
    $blogs = $wpdb->get_results($query);
    
    echo '<ul>';
    foreach($blogs as $blog){
        $blog_details = get_blog_details($blog->blog_id);
        echo '<li><a href="'. $blog_details->siteurl .'">' . $blog_details->blogname .'</a></li>';
    }
    echo '</ul>';
}
?>