It is but as third party http://forum.blockland.us/index.php?topic=255973.0
It doesn't work 4 me.
Did you place it in the correct folder?
Documents> Blockland> Add-Ons NOTE: a > infront of a word means that I go to that area.
Off STEAM
That isn't your steam directory. You need to go toSteam\SteamApps\common\Blockland\Add-onsBlockland without steam is located in documents.