Alternativy k MTcaptcha pro Linux s licencí open source

• Linux
  Všechny platformy 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
• Licence Open Source
  Jakákoli licence Bezplatná licence Licence Open Source Komerční licence