The Elder Scrolls III: Morrowind is the third main installment in Bethesda Game Studios' line of fantasy role-playing games, The Elder Scrolls, and was initially released in 2002. Several installments of downloadable content exist for Morrowind, such as the two main expansions, Tribunal and Bloodmoon, and eight smaller, free, official plugins.
The latter were originally downloadable from http://www.elderscrolls.com/morrowind/expansions/ before the page's removal, though (as of 4/2/2019) they still could be downloaded from official servers; they are archived here in the event that the originals are no longer available from the publisher. They are included as part of the Game of the Year version available from GOG.com, but must be manually enabled once installed. These eight plugins are:
Entertainers (released May 10th, 2002): "Speak with Dulnea Ralaal in Balmora, Eight Plates on the topic "entertain the patrons". She will give you options to tell jokes, dance the high-kick, play the drum, play the lute and sing, or juggle."
Bitter Coast Sounds (released May 31st, 2002): "Let the gentle chorus of swamp wildlife draw you further into the mire throughout the entire swampy region of the Bitter Coast. You'll find dragonfly creatures now inhabit the muck ponds along the coast. "The areas in which the sounds are placed cover the extreme southwest portions of the island of Vvardenfell. From the south, the placement starts directly west of Vivec and slopes diagonally northwest along the coast including the towns of Seyda Neen, Hla Oad, and Gnaar Mok."
Area Effect Arrows (released May 31st, 2002): "Visit Aradraen the Fletcher in Vivec's Foreign Quarter Lower Waistworks for the world famous area effect arrows exclusive to her shop."
Helm of Tohan (released June 14th, 2002): "The Adamantium Helm of Tohan is a rare and powerful artifact lost in the Sheogorad Region. Travel north to Dagon Fel to find out more about this legendary helm."
Master Index (released June 21st, 2002): "This is a quest to find the ten propylon indices. In return for completing this quest, you will receive the Master Index, allowing the you to travel to any propylon chamber, or return to the Caldera Mages Guild from any propylon chamber."
LeFemm Armor (released July 1st, 2002): "LeFemm Armor, specially tailored for the ladies, is on sale at the Fighters Guild in Vivec, from Sirollus Saccus in Ebonheart, the Redoran Vaults, and the lady smiths in Ald-ruhn, Sadrith Mora, and Ald Velothi."
Adamantium Armor (released August 2nd, 2002): "A new shipment of hard to find Adamantium Armor has arrived in places across Vvardenfell. You can find it at Meldor's Armory in Balmora, Hodlismod's shop in Caldera, Dandera Selaro's outdoor stand in Ald-Ruhn, and Ralen Tilvur's Smithy in Vivec."
Siege at Firemoth (released September 13th, 2002) "The island fortress of Firemoth was taken by the skeleton army of Grurn years ago. It's time to take it back. Sellus Gravius, Captain of the Seyda Neen Census and Excise Office, hires you to lead a band of adventurers to the Fort."
One notable detail about these plug-ins is that elements of them eventually found their way into the larger expansions. For instance, the Helm of Tohan and Adamantium Armor plugins had similar armor reintroduced in Tribunal, which also properly implemented the female variants of various armors from the base game introduced in the LeFemm Armor plugin, providing variety for female player characters while also correcting an error from said earlier plugin that prevented the replacements from appearing.
Each individual plugin archive includes instructions in .TXT form on how to install them into The Elder Scrolls III: Morrowind.
Files scanned with Malwarebytes Free 3.7.1 as of 4/2/2019.