Creatures and NPCs
Inject more life into Morrowind, and make those critters prettier, to boot.
Better Dialogue Font and Less Generic NPCs
Download link (Better Dialogue Font)
If you're sick of squinting at the font for Morrowind's dialogue, journal, and menus then the Better Dialogue Font mod ups the resolution on all of them. Meanwhile, if you're sick of NPCs rehashing the same paragraphs of information the Less Generic NPC project has been working to give every character their own dialogue, which is a heck of an undertaking.
Better Beasts
In the spirit of Better Bodies and Better Heads, this adds new textures for lizard-people and cat-people, making the Argonians and Khajiit look plenty nicer. If you're playing as one you'll have a few new head options as well.
Morrowind Children
Bothered by the absence of kids? Ma'iq the Liar would like a word with you. If you need to have rugrats running all over the place this mod will do it for you, though as with all mods that add NPCs en masse it can cause slowdown and they absolutely will get stuck between you and a door at some point.
Morrowind Advanced
Bethesda staff member Gary Noonan, known to modders as WormGod Elite, made Morrowind Advanced to add more challenging encounters. It rebalances existing creatures as well as adding new ones like Centurion Rippers and Giant Earth Golems, and eventually you'll have to deal with high-level raiders too. A few new dungeons and some new equipment thrown into rebalanced loot tables round it out.
Creatures Version XI
Adding new animals to Vvardenfell is tricky because the existing ones are so alien. Horses would just feel wrong. Modder Piratelord walks a fine line in new additions that feel appropriate to the setting like the Ash Poet and Land Dreugh as well as more vanilla creatures added sparingly, like moose and butterflies. As an added bonus this mod makes Cliff Racers less aggressive the more of them you kill so that eventually the damn things will leave you alone.