Denwer is described as 'Collection of often-used web-servers for web-programmers. It is used to debug web-sites under Win32. Denwer includes: friendly installer; Apache; PHP; MySQL; Perl; virtual host management system; phpMyAdmin; sendmail stub; start/stop manager' and is a Web Server in the development category. There are more than 25 alternatives to Denwer for a variety of platforms, including Windows, Mac, Linux, Self-Hosted and Redis apps. The best Denwer alternative is XAMPP, which is both free and Open Source. Other great apps like Denwer are WampServer, BitNami Application Stacks, MAMP and AMPPS.