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Roundcube is a web-based free and open source webmail software program. It is written in PHP and is typically installed on a LAMP (Linux/Apache/MySQL/PHP) stack. The first version was released in 2008, and the lastest stable version is Roundcube 1.3.

Roundcube webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an email client, including MIME support, address book, folder manipulation, message searching and spell checking.


  • Multilingual capabilities
  • Find-as-you-type address book
  • Richtext/HTML message composing
  • Searching messages and contacts
  • Canned response templates
  • Int. domain names (IDNA)
  • Shared folders and ACL
  • Full featured address book
  • Extensible using the Plug-in API

— from Roundcube’s home page.

Next Open Source Tuesday will feature the Debian project.