These links are also available in Links section, but I think it's better to mention them twice. Anyway, I've got nothing to download from here yet.
Latest patches from Elder Scrolls III official site.
FPS Optimizer - a useful program to improve performance and graphics in Morrowind. You can get up to 200% view distance.
TES Advanced Mod Editor - great program for cleaning mods.
Morrowind Interactive Map - map that shows all locations in Morrowind, very helpful in adventuring.