The Unofficial Patch is not really a mod, but while the default basic patch mostly only fixes bugs, the optional plus patch, that can be choosen at installation, is like a restoration project, adding a lot missing content, including new quests, levels, weapons, items, characters, dialogue, graphics, models, sounds and original music!
Vampire: The Masquerade - Bloodlines Unofficial Patch 10.6
+Repaired broken melee of Ming and created new item gained message.
+Improved all cars and tutorial guard audio, thanks to endthewars.
+Fixed Frenzy to really use the boosted stats, thanks EntenSchreck.
+Adjusted firearms ammo cost and restored one for the basic patch.
+Restored Jeanette and Therese dialogue and many more unused lines.
+Made Heather throw away old pizza and not being visible as ghost.
+Fixed normal SWAT being biteable and Hallowbrook Atrium confusion.
+Made killing junkyard dog cost Humanity and Pisha meal disappear.
Corrected alternative way of hitmen's peace and minor file issues.
Removed two plus emails from basic and fixed other minor details.
Fixed Nines' camera view at observatory and Romero's combat stats.
Specific Crowbar tool created for Bloodlines, thanks to ZeqMacaw.
ZeqMacaw's and DDLullu's tools integrated in SDK, thanks Psycho-A.
Fixed bombguy's explosion radius and two shopping carts' physics.
Restored dispatching Dima for Malkavians and raised tutorial ammo.
Removed shortcut at museum and fixed guard dropping workroom key.
Fixed name of museum in computers and basic max flamethrower ammo.
Repaired "Bloodsucker Communion" name and Numina names and icons.
Fixed tutorial location continuity in downtown, thanks endthewars.
Restored sound to Vesuvius easter egg and made it easier to find.
Fixed exploit to get the werewolf blood and some dialogue details.
Corrected loader-linux script to work for bash, thanks to GaGGaG.