Shoutbox by Siropu 1.3.5

This is a shoutbox widget that you can add in any of the available widget positions.

Options:

1. Minimum age required - Enable shoutbox based on user's age.
2. Shoutbox refresh interval - Allows you to set refresh interval for new messages. This option can be disabled.
3. Maximum shout length - Set the maximum allows shout length.
4. Minimum time between shouts - Flood check (with user group permission to bypass it)
5. Shout display limit - Set the maximum number of shouts to display on page load.
6. Delete shouts older than - Allows you to auto-delete shouts older than x days.
7. Auto prune shoutbox every x hours.
8. Auto prune message.
9. Enable navigation tab - Allows you to chat in a dedicated page
10. Enable sound - Enable sound notification for new shouts.
11. Enable avatars - Display user avatar in shout.
12. Allow BB codes - Controls if BB codes are parsed or not.
13. Enable auto link - Auto link/embed URLs and media sites.
14. Enable smilie button - For easy smilie access.
15. Reverse ordering - Place input box at the bottom and display new messages from the bottom to the top
16. Footer - Allows you to add custom content (text, ads, etc) in the shoutbox footer.
17. Thread ID - Post shouts in a dedicated thread as well.
18. Thread message minimum length - Set minimum length required for shouts.

It has user group permissions for using shoutbox, editing/deleting shouts, prune shoutbox (/prune)
When scrolling at the bottom of the shouts, older shouts will be automatically loaded.

If you want a feature rich chat application, please see my Chat 2 add-on.
Shoutbox demo is available here: https://www.siropu.com/forums/