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<?php
/*
 * Single Site Dashboard Widget
 */
add_action('wp_dashboard_setup', 'wpse_54742_wp_dashboard_setup');

function wpse_54742_wp_dashboard_setup() {
    wp_add_dashboard_widget( 'wpse_54742_active_site_plugins', __( 'Active Plugins' ), 'wpse_54742_active_site_plugins' );
}

function wpse_54742_active_site_plugins() {
    $the_plugs = get_option('active_plugins'); 
    echo '<ul>';
    foreach($the_plugs as $key => $value) {
        $string = explode('/',$value); // Folder name will be displayed
        echo '<li>'.$string[0] .'</li>';
    }
    echo '</ul>';
}


/*
 * Multisite Dashboard Widget
 */
add_action('wp_network_dashboard_setup', 'wpse_54742_network_dashboard_setup');

function wpse_54742_network_dashboard_setup() {
    wp_add_dashboard_widget( 'wpse_54742_active_network_plugins', __( 'Network Active Plugins' ), 'wpse_54742_active_network_plugins' );
}

function wpse_54742_active_network_plugins() {
    /*
     * Network Activated Plugins
     */
    $the_plugs = get_site_option('active_sitewide_plugins'); 
    echo '<h3>NETWORK ACTIVATED</h3><ul>';
    foreach($the_plugs as $key => $value) {
        $string = explode('/',$key); // Folder name will be displayed
        echo '<li>'.$string[0] .'</li>';
    }
    echo '</ul>';


    /*
     * Iterate Through All Sites
     */
    global $wpdb;
    $blogs = $wpdb->get_results($wpdb->prepare("
        SELECT blog_id
        FROM {$wpdb->blogs}
        WHERE site_id = '{$wpdb->siteid}'
        AND spam = '0'
        AND deleted = '0'
        AND archived = '0'
    ", null ));

    echo '<h3>ALL SITES</h3>';

    foreach ($blogs as $blog) {
        $the_plugs = get_blog_option($blog->blog_id, 'active_plugins'); 
        echo '<hr /><h4><strong>SITE</strong>: '. get_blog_option($blog->blog_id, 'blogname') .'</h4>';
        echo '<ul>';
        foreach($the_plugs as $key => $value) {
            $string = explode('/',$value); // Folder name will be displayed
            echo '<li>'.$string[0] .'</li>';
        }
        echo '</ul>';
    }
}