inter forum

http://wiki.simplemachines.org/smf/SMF2.1:Features

SMF 2.1.x is a very versatile forum software. It has many features, including the following:
Minimum requirements

    PHP 5.3.8+
    MySQL 5.0.3+ or PostgreSQL 8.0+

General

    Automated Installation of mods on non-default themes
    "Smart emulation" to automatically detect a mod's version and to automatically emulate this mod when it is installed
    Improved attachment security
    Improved attachment error handling
    SCEditor (New WYSIWYG editor)
    Drafts
    Enhanced admin panel
    IPv6 Support
    Built in support for jQuery
    Full SSL Support
    Verification questions support for multiple answers and multiple languages
    Deny access to boards
    Moved topics placeholders can be set to auto expire/delete
    Topic preview when hovering over subject on message index
    Likes System
    Mentions System
    Alerts systems for Notifications, Likes, and Mentions
    Topic notifications can be set to Not Following, No Alerts or Email, Receive Alerts and Receive Emails and Alerts
    Personal Messages automatically saved in sent box
    Default theme is responsive
    Ical calendar event export support
    Gravatar support