AddonServers

To connect to the default Add-on server from inside Wesnoth, use Add-ons option from the title screen. Alternatively, all web servers can be viewed at this page: addons.wesnoth.org. The web page is for reference purposes, archival purposes, and for people who cannot use the game client for technical reasons or otherwise. You may have a look at the list of add-ons available from each one and optionally download their contents from here. The recommended way is to install via the in-game client as mentioned earlier.

Also, from the in-game client, it is possible to connect to another version's Add-on server by using the correct port address like this: addons.wesnoth.org:15018, where the last two digits of the port specified (15018) are the same as the last two digits of the Wesnoth version whose add-on server you wish to connect to. In this example, it will connect to addons.wesnoth.org/1.18/. Note that this is in general not recommended because Add-ons from another version may not be compatible or refuse to correctly work, and is intended for advanced users or for development purposes only. The port scheme may change at any point in the future and is not recommended to be used as a permanent link.