What are my options?

[Dimers]

I'm looking for a list of the races, classes and backgrounds that have been published by WotC. Ideally the list would include UA "throw it at a wall and see what sticks" material along with finished products, and would have links to anything openly available. Listing homebrew options would be nice too but not crucial.

Does this already exist? I couldn't find it among the "5e Notable Threads". If it doesn't exist, does anyone want to take a crack at making one? I'd compile it myself, but I really don't stay up-to-date enough with 5e.

[Specter]

Grod did something like that.

[Dualswinger]

At risk of linking to the hive of scum and villainy that it is, the 1d4chan wiki at least has a full list with summaries of most "official" content

[Astofel]

As it so happens, I made something like this myself not too long ago, it's right over here (https://docs.google.com/document/d/16YrwGdRMRRNyNGuwnKxWlWcdpB1mGB0SdIQedwWTAOQ/edit?usp=sharing).
It includes all the races, classes, and backgrounds made by WotC that I could find, including Plane Shift Zendikar and Innistrad. The only things I deliberately didn't include were the UA versions of Swashbuckler and Storm Sorcerer, the first shot at the revised Ranger, the first shot at the Mystic, and the DMG version of the Aasimar, because in my opinion all those have been rendered obsolete by later material.

[Dimers]

As it so happens, I made something like this myself not too long ago, it's right over here (https://docs.google.com/document/d/16YrwGdRMRRNyNGuwnKxWlWcdpB1mGB0SdIQedwWTAOQ/edit?usp=sharing).

Whoops, missed this response before. Thanks, that's really helpful! And I see it's updated for Volo's, too.