This RoundCube plugin adds the Google 2-step verification to the login proccess (OTP)
Plugin Manager Installer
Protectimus OTP solution for Roundcube
CardDAV adapter for connecting to CardDAV-enabled addressbooks
This chbox plugin adds the convenient functionality of making single and/or multiple selections from a number of emails in Roundcube message list.
Add Piwik tracking server-side code to all requests in Roundcube
Duo Security two-factor authentication for Roundcube. Users have multiple ways to authenticate, including: 1. One-tap authentication using Duo’s mobile app. 2. One-time passcodes generated by Duo’s mobile app (works even with no cell coverage) 3. One-time passcodes delivered to any SMS-enabled phone. 4. Phone callback to any phone (mobile or landline!) 5. One-time passcodes generated by an OATH-compliant hardware token