Community unofficial patch
http://www.ravenmodding.terminal47.net/?p=768
Stutter remover - fixes general Bethesbryo engine problems that have been there since Oblivion
http://newvegas.nexusmods.com/mods/34832
Better Game Performance - removes unused objects from the game
http://newvegas.nexusmods.com/mods/40128
Alt+Tab fix (borderless window)
http://newvegas.nexusmods.com/mods/42956
Purge Cell Buffers
http://newvegas.nexusmods.com/mods/36805
CASM save system (very useful considering how prone Bethesbryo games are to breaking)
http://www.newvegasnexus.com/downloa...e.php?id=36730
DARNified UI
http://forums.bethsoft.com/topic/114...rnified-ui-nv/
Primary Needs HUD (useful if you're running Hardcore Mode, which you should be frankly)
http://newvegas.nexusmods.com/mods/38538
Grenade + Melee weapon hotkeys
http://newvegas.nexusmods.com/mods/38808
Unified HUD project (Needed if you wish to use all of the above UI mods in tandem)
http://newvegas.nexusmods.com/mods/38961
NMC's High Resolution texture pack
http://newvegas.nexusmods.com/mods/43135
Bornagain's armour retextures (Book of Steel compilation)
http://newvegas.nexusmods.com/mods/39873#content
Enhanced blood textures
http://newvegas.nexusmods.com/mods/34917
HR Pipboy reskin (works with FO3 too)
http://newvegas.nexusmods.com/mods/35796
HR lockpick mini-game reskin (works with FO3 too)
http://newvegas.nexusmods.com/mods/39945
Fellout - shitty orange tint be gone in favour for naturally lit environments. Also genuinely dark nights, making it very STALKER-ish ( Very atmospheric and requires you to use the Pipboy light a lot more.)
http://www.newvegasnexus.com/downloa...e.php?id=34888
ILO - relights in-door environments. Again, very atmospheric and requires you to use the Pipboy light a lot more.
http://newvegas.nexusmods.com/mods/35794
Inventory Sorter - Adds category prefixes to inventory items for easier sorting.
http://newvegas.nexusmods.com/mods/38604
Manual Reload - stops you from automatically reloading every time you empty your guns. Very annoying considering that reload animations can't be cancelled - you're locked into them, leaving you vulnerable.
http://newvegas.nexusmods.com/mods/37090
Sprint mod - http://www.newvegasnexus.com/downloa...e.php?id=34943
Self-explanatory. You can consume AP to sprint for short bursts.
Bottle That Water - refill empty containers from water sources. Useful for Hardcore Mode.
http://newvegas.nexusmods.com/mods/34840
Portable campsite - portable camp fire (for cooking, crafting, etc) and a bedroll
http://newvegas.nexusmods.com/mods/35134