This list does not include anybody including their version of Werewolves Of London on a Hallowe'en Compilation, any mention of Kid Rock's use of WOL in "All Summer Long" or any and all Karaoke versions of Zevon songs.  Also, it does not include the performances already listed in the two Tribute Albums, "Enjoy Every Sandwich" and "Hurry Home Early."

A Bullet for Ramona
Don't Throw Your Love Away
Jack-O & the Tennessee Tearjerkers
A Bullet for RamonaCrackin' Up
South Filthy
Accidentally Like A MartyrThe Maximalist
Thomas White
Accidentally Like A MartyrInner Smile
Jenna Mammina
Accidentally Like A MartyrAll Good ThingsJerry Garcia
Accidentally Like A MartyrSlipcover (instrumental)
Jimmy Webb
Accidentally Like A Martyrbrother sister
Watkins Family Hour
Boom Boom ManciniContenderBorn 53
Boom Boom ManciniCody Sings ZevonPhil Cody
CarmelitaDogs Without Fear of Dying
CarmelitaDos Seres Que Se AmanLos Cachorros
Carmelita**15 Exitos Gigantes, Vol. 2Ramón Ayala
CarmelitaHappiness & All the Other ThingsCross Canadian Ragweed
CarmelitaThe I-10 Chronicles
The I-10 Chronicles
CarmelitaThe Super Commando
CarmelitaAcoustic Trio in Berlin
Willie de Ville
CarmelitaBest of Murray McLauchlanMurray McLauchlan
Son of a SingerPaul Scott-Williams
CarmelitaSimple DreamsLinda Ronstadt
CarmelitaImus Ranch Record Vol. 2Adam Duritz/Counting Crows
CarmelitaReprise Baby PleaseDwight Yoakam
CarmelitaSomethin' Else10 City Run
CarmelitaPartnersFlaco Jimenez (w/Dwight Yoakam)
CarmelitaHatedG.G. Allin
Desperadoes Under The Eaves
The Blue Room 2013
Madeleine Peyroux
Desperadoes Under The EavesCody Sings Zevon
Phil Cody
Detox Mansion Dad Get Me Out Of ThisThe String Quartet Tribute
Dirty Life and Times
Made in Brooklyn
John McEuen with Matt Cartsonis
Don't Let Us Get SickCody Sings Zevon
Phil Cody
Don't Let Us Get SickFolk Years 2003 - 2003Jill Sobule
Don't Let Us Get SickLive at the City Lights Saloon 2004
Pat Guadagno
Excitable Boy(as heard on "Californication")Boys Club
Excitable BoyDad Get Me Out Of ThisThe String Quartet Tribute
Excitable BoySouth of the BorderDreadnaught
Excitable Boy
Made in Brooklyn
John McEuen with Matt Cartsonis
Frank And Jesse JamesDrive SouthAndy Owens
Frank And Jesse JamesMandorock 2000 Live Phil Beer
CaliforlorniaJohn Murry
Gorilla You're A DesperadoI Won't Be MeChris DeMay
Hasten Down The WindHasten Down The WindLinda Ronstadt
Hasten Down The WindDad Get Me Out Of ThisThe String Quartet Tribute
Hasten Down The Windand Friends 2
Kumiko Yamashita & Ohsawa Yoshiyuki
Heartache Spoken Here
Cody Sings Zevon
Phil Cody
Heartache Spoken HereNightjar and the GardenJess Reimer
Hostage-OLove and DestructionMichael Wolff
Hostage-O3 of Swords
Mimi Oz (claims partial writing credit)
Hula Hula BoysCody Sings ZevonPhil Cody
I'll Sleep When I'm DeadDad Get Me Out Of ThisThe String Quartet Tribute
I Was In The House...Dad Get Me Out Of ThisThe String Quartet Tribute
Indifference Of HeavenBig TwangDavid Lindley
Indifference Of HeavenCody Sings ZevonPhil Cody
Johnny Strikes Up The BandCody Sings ZevonPhil Cody
Join Me In L.ABoulder
Keep Me In Your Heart
Keep Me in Your Heart for a While: The Best of Madeleine PeyrouxMadeleine Peyroux
Keep Me In Your Heart
Fair WebberBarb Webber
Keep Me In Your HeartEverything's Beautiful NowChristine Albert
Keep Me In Your HeartDad Get Me Out Of ThisThe String Quartet Tribute
Lawyers, Guns And Money 
Peace of Mind
Bhi Bhiman
Lawyers, Guns And MoneyZombination
Lawyers, Guns And MoneyThe Bocephus Box
Hank Williams Jr.
Lawyers, Guns And MoneyDad Get Me Out Of ThisThe String Quartet Tribute
Lawyers, Guns And MoneyTwo Steps AheadJim McCarty Band
Lawyers, Guns And MoneyOutside Woman BluesJim McCarty
Lawyers, Guns And MoneyIf I Weren't So Romantic, I'd Shoot YouRick Derringer
Lawyers, Guns And MoneyVH1 StorytellersMeat Loaf
Lawyers, Guns And MoneyStories We Could TellStage Dolls
Lawyers, Guns And MoneyMidamericaTravis Kidd
Like The SeasonsHappy TogetherThe Turtles
Lord Byron's Luggage
Cody Sings Zevon
Phil Cody
Mohammed's Radio
Solid Ground
Eugene Brosnan
Mohammed's Radio
Livin' in the U.S.A.Linda Ronstadt
Mohammed's RadioRide the TimesThe Iain Ad Venture
Mohammed's RadioIt Might As Well Rain Until SeptemberSusan Cowsill
Monkey Wash Donkey RinseBig TwangDavid Lindley
Lights Out in Wonderland
Carl Carlton
MutineerLost HillsTerence Martin
MutineerFresh Wine for the HorsesRob Dickinson
MutineerSea Songs
Jason Isbell & Amanda Shires
Cody Sings Zevon
Phil Cody
My Shit's Fucked Up
Revolution on Repeat
Troubled Horse
My Shit's Fucked UpPeace of Mind
Bhi Bhiman
Nighttime In The Switching YardWhispering PinesProf. Louie & the Crowmatix
Nighttime In The Switching YardEasyGrant Green
Outside ChanceSave the Turtles (Greatest Hits)The Turtles
Outside ChanceLadies and gentlemen...The Bangles!The Bangles
Play It All Night LongCody Sings ZevonPhil Cody
Play It All Night LongCooder/Lindley FamilyRy Cooder, David Lindley, et al.
Play It All Night LongLearning to DrownZach Seibert
Play It All Night LongLive from Studio EastMuscadine
Play It All Night LongHalcyon Days (Bonus Track)Bruce Hornsby
Play It All Night LongFine Print: CollectionDrive-By Truckers
Play It All Night LongPolecat Boogie RevivalPolecat Boogie Revival
Poor Poor Pitiful MeDad Get Me Out Of ThisThe String Quartet Tribute
Poor Poor Pitiful MeSimple DreamsLinda Ronstadt
Poor Poor Pitiful MeJust the SameTerri Clark
Poor Poor Pitiful Me (On cassette & vinyl only)
...And No One Else Wanted to Play
Poor Poor Pitiful MeDéraisonnableSylvie Vartain
Reconsider Me
Reconsider MePirate Radio
The Pretenders
Reconsider MeEnchanted: The Works of Stevie NicksStevie Nicks
RenegadeLove Conquers AllSteve Haggard
Roland The Headless Thompson GunnerTales from the Weeping WillowNaomi Bedford
Roland The Headless Thompson Gunner
Cody Sings Zevon
Phil Cody
Roland The Headless Thompson GunnerSolid GroundEugene Brosnan
Roland The Headless Thompson GunnerCoversLauren O'Connell
Roland The Headless Thompson GunnerDad Get Me Out Of ThisThe String Quartet Tribute
Searching For A HeartRed River BlueLuke Olson
Seminole Bingo
You're Welcome
Electric Six
Seminole Bingo
Big Twang
David Lindley
She's Too Good For MeGhost Town
Marley's Ghost
Splendid IsolationVoices in the WindDoug Jayne
Splendid IsolationNightcrawlerPete Yorn
Splendid Isolation
MiasmiThe Bevis FrondThe Bevis Frond
Splendid IsolationCody Sings ZevonPhil Cody
StudebakerInsides OutJordan Zevon
Tenderness On The BlockSliding Doors: Movie SoundtrackPatty Larkin
Tenderness On The BlockFat CityShawn Colvin
They Moved The MoonDisturbs the AirPsychatrone Rhonedakk
Werewolves Of LondonVery Greasy
David Lindley
Werewolves Of LondonDad Get Me Out Of ThisThe String Quartet Tribute
Werewolves Of LondonWerewolves of Red RocksGrateful Dead
Werewolves Of London Hard to Love a ManMagnolia Electric Co.
Werewolves Of LondonJumpin' in the NightThe Flaming Groovies
Werewolves Of LondonThey'll be Waking Up SoonFrankenstein 3000
Werewolves Of LondonGreetings from London The CDM Globetrotters
Werewolves Of LondonWerewolves Of LondonThe Werewolves Of London
Werewolves Of London
Driving Songs, Vol. 2
Widespread Panic
Werewolves Of LondonThree TV commercials for "Three Olives Vodka" (2015)

Quite a few other artists, while not having recorded Zevon songs in the studio, perform them while on tour.  Some examples: Bob Dylan, Jimmy Buffett, Bruce Springsteen, Jackson Browne, The Rock Bottom Remainders...