Assemble is a GPLv3, database-less, full featured html chat system meant to be quick to set up and easy to host. It supports auto-expiration of messages, autoparses links and images and more.

• User token generation/signup (pub/priv segments) and sign-in.
• Ban/unban system
• In-memory only storage system for chat rooms, history, etc
• Manual message deletion
• User-configurable per-message expiration time
• Phone friendly, Tablet friendly UI
• Auto-process message content for links, image embeds, etc
• User avatars
• Desktop notifications API
• Private chat rooms
• Direct Messaging
• Text message / email notifications
• Auto-embed video links

Thanks goes to Sebastian Kraft for providing public domain smilies: http://opengameart.org/content/cubikopp-qubic-smilies | Other icons/smileys were obtained from openclipart.org and are licensed for public domain.