From memory;
Cher has performed Take It To The Limit and Those Shoes.
Tom Jones has murdered Take It To The Limit.
The Killers and The Gypsy Kings of course have performed Hotel California.
Stereophonics have a faithful version of The Last Resort on the b-side of one of thier singles.
Similarly Richard Marx released a live cover of Take It To the Limit, with an awful 80s guitar solo but the added bonus of Meisner and Schmit both helping out on vocals.
I'm pretty sure Richard also did a live performance of Dirty Laundry with celebrity news readers doing the vocals.
Journey Of The Sorcerer was adopted as the theme tune for the Hitchhiker's Guide To The Galaxy, Radio, TV and film adaptations. I think it was rerecorded at some point or two.
Solo wise there are a striking number of low grade South Pacific covers of Glenn's (plus the Eagles twice) Lover's Moon on YouTube.
Joe's main tunes are;
Rocky Mountain Way (Ozzy Osborne and Michael Bolton (Bolotin) are unforgettable),
Funk #49 (Van Halen & The Black Keys, Puddle Of Mudd)
Collage (Hedge & Donna, Golden Earring, Howling Rain, Adam Green And Binky Shapiro & The Three Degrees )
I reckon Hedge & Donna's Collage is the first Walsh song I ever heard, many years before I heard The James Gang original. Even before I discovered Walsh. It's so obscure I haven't a clue how I heard it or how I remembered it.
I think Joe's only performed Collage a couple of times during James Gang reunion shows.
There's a few others. There may be enough for a Joe Walsh tribute album.
Timothy's, Tell Me What You Dream was an sizable 80s hit for Restless Heart. Judie Tzuke covered Tim's (Poco) I Can See Everything.
Henley's been covered by Ataris, DJ Sammy & Show Of Hands (Boys Of Summer), India Arie (Heart Of The Matter) and Lisa Marie Presley (Dirty Laundry). I'm sure there are others.
I'm not aware of any covers of the other three, but Felder's been known to do a few Eagles covers in his live set list.