Campfire: Instant Messaging for Groups

http://www.campfirenow.com/

Campfire is a web-based group chat tool that lets you set up password-protected chat rooms in just seconds. Invite a client, colleague, or vendor to chat, collaborate, and make decisions. Link to a room on your intranet for internal communications.

Campfire is especially great for groups with remote workers. There's no better way to keep everyone together when everyone's apart. It's as simple as visiting a web page.

Your Campfire chats are password protected and safe from prying eyes. You decide who you invite. You set up the rooms. You specify who can see which rooms

There are so many ways to use Campfire. Chatting, file sharing, image previewing, decision making, etc. Up to 60 people can chat at once. You can even browse previous chats by person,
room, or date.

The free plan allows up to 4 simultaneous users, 10MB storage and transcripts. Upgrades are available to allow more users and storage space.