This small Plugin allows you to redefine how the Nether-Portals in Minecraft work.
You can just disable Portals or just change the type from obsidian to glowstone.... Or just add more Portaltypes to other Worlds.
Also you can set commands that run if the player enteres a portal!
By default there is the default link between 'world' and 'world_nether'.
You can just add new materials and change destination or origin such as messages when you enter the world or create an portal!
Portal between Overworld and TheEnd (with Endstone as portalblock)