Xdebug (%http://www.xdebug.org/%) |00AA00|Separate Client & Server.| |00AA00|GUI & CLI interfaces.| |00AA00|Cross-platform.| DBG (%http://dd.cron.ru/dbg/%) |00AA00|DDD interface.| |FF0000|*NIX only.| APD (%http://pecl.php.net/apd/%) |00AA00|Excellent profiler.| |FF0000|No so good at debugging.| Zend Studio (%http://www.zend.com/%) |00AA00|Cross-platform.| |00AA00|Easy GUI.| |FF0000|$$$ Por favor.|