[Klonoar]

jQuery is the one that’s outlasted them all, but yes - there were absolutely other frameworks in use. It also discounts the detour into the Backbone era before Angular and React took off.

[paradox460]

I've interacted with devs who still bring in prototype.js

Within the last year even

[arbol]

MooTools springs to mind

[Klonoar]

MooTools, Prototype, Dojo, YUI... what an era.

It sometimes feels like part of what we deal with now in the JS world is due to half the crowd not knowing what came before.

(Edit: to be clear, I think the other half is responsible for the advancements... so it probably evens out)

[Izkata]

One of the systems I currently work on has all five of those. Which one was in use was developer's choice for pretty much any given page or feature.