Alternatif untuk MTcaptcha untuk Self-Hosted dengan lesen sumber terbuka

• Self-Hosted
  Semua platform Windows Mac Linux Android iPhone Windows Phone iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) PHP Wordpress Joomla .NET Framework ASP.NET Drupal Drupal Commerce ASP.NET MVC JSP MyAdmin JSP/MySQL Administrador Web
• Lesen Open Source
  Mana-mana lesen Lesen percuma Lesen Open Source Lesen komersil