For those who do not know, Morroblivion is a modding project for Oblivion. It recreates Morrowind using the Oblivion game. Basically, it is a series of mods for Oblivion, that add Vvardenfell, and all the quests and characters from Morrowind. You have to own both Oblivion and Morrowind to use it.
TES Renewal is where you can find Morroblivion, as well as other cross-game projects like Skywind and Skyblivion.
You can download the core Morroblivion mod files Here. There are also links to a handful of other mods you will need to run it, like OBSE, Elys Silent Voice, etc...
There are a number of optional mods you can use that come bundled in with the main pack, like an improved map.
There are also some standalone mods people have made for Morroblivion. You can find most of them with a search on Morroblivion on the Nexus. You can also find a list of mods here as well, but a lot of the links are old and now broken.
Morroblivion Improved - makes some improvements to the game world, adding more buildings, landscape effects, and so on. Basically it makes the world seem less empty.
Portal To Vvardenfell - Automatically gives you a spell that creates a portal between the Morroblivion game world and the regular Oblivion game world. Very handy for going back to Oblivion to pick up modded items that have been placed in containers in the Imperial City or such places in Cyrodiil. Or to buy modded spells from mod-added NPCs, and stuff like that.
Because it uses the Oblivion engine, it plays just like Oblivion does. You use the Oblivion face generator to create your character. It has the Oblivion skills and spell system. It levels up like Oblivion. It uses the same animations as Oblivion.
But it has new meshes for all the Morrowind items and such, like buildings, ships, and so on. It has the Morrowind plants, though alchemy still works the same say it did in Oblivion (since the Oblivion game engine). The music is the Morrowind music, which is really nice. They even kept the original Morrowind voices for many, if not all characters. You need the Silent Voice mod because not everything is voiced, so sometimes you will just get text when you talk to people. But the generic greetings are in the Morrowind voice actors.
There are also Morrowind-style weapons and armor, like Chitin and Netch Leather armor, Nordic Ringmail, and so on. The Imperial Armor is the Morrowind style, except for the shields, which are the standard Oblivion Imperial shields.
It really feels like playing Morrowind, but without the less than stellar graphics and awful animations.
I have been playing January in Morroblivion for a few days now. She has been exploring the area around Seyda Neen, and is living in Gilnith's Shack (she completed the tax collector quest and killed Gilnith). Today she swam out to Fort Firemoth, and has been battling her way through the hordes of skeletons outside. She now has just over 1700 iron arrows that she took off of dead skeleton archers.
I am not sure if Firemoth has a quest that you are supposed to start in Seyda Neen by talking to the guy in the Census Office or not. I will have to go back and check.
I am pretty much addicted to this game now that I've started Igodah up again. Only problem (for me) is all the NPCs are named, which means eventually the action moments become rather rare. For this reason I picked up some Skyrim for the first time this season. Lots of 4ct10n pwn4g3 in that game!
She really does look content. 
