/*ACF*/
<?php
include_once( ABSPATH . 'wp-admin/includes/plugin.php' );
if ( is_plugin_active( 'advanced-custom-fields/acf.php' ) )
{
//plugin is activated
}
?>
/*wpml*/
<?php
include_once( ABSPATH . 'wp-admin/includes/plugin.php' );
if ( is_plugin_active( 'sitepress-multilingual-cms/sitepress.php' ) )
{
//Do something
}
?>
<?php
include_once( ABSPATH . 'wp-admin/includes/plugin.php' );
if ( is_plugin_active( 'revslider/revslider.php' ) )
{
//Do something
}
?>