A TModLoader mod adding portals that can teleport you to multiplayer servers!
In order to add portals into your world, you will need a "Spawn-in" plugin such as Cheat Sheet or HERO's Mod. Once you have the portal in hand, use right-click to edit the server information attached to the portal. Once you're finished, left-click to place the portal!
To use a portal, all you have to do is right-click it when it is placed in the world. All portals are saved into your world file and persist through singleplayer and multiplayer.
You can add your own portals utilizing the built-in Api. See https://github.com/xNarnia/ExampleServerPortals for more info!