Can anybody recommend a good, non-AT&T DSL provider?

Depending on your location, you might be SOL with DSL. Some areas have an effective monopoly on carriers; for example, if you live in my neighborhood your line is provisioned by Verizon / Frontier. You have no choice.
However, you do not necessarily have to have your carrier as your ISP. In some markets, ISP resellers exist- you can do business with them instead of the big carrier, and their policies will likely differ. It’s worth a look.
Good luck!

I think @koanhead pretty much nailed it. Around here, those that don’t like dealing with Frontier generally wind up with a Comcast cable connection while those that don’t like Comcast either do without internet access. Back in NH, it was pretty much the same deal only with different names.

BTW, if this country had proper Capitalism, the markets would not allow/tolerate monopolies (effective or total) the way we do.

I know Earthlink used to offer DSL service. Might want to check with them.

We have Verizon FIOS for everything now.

Many companies use the AT&T structure to give DSL service, so you could contract with Company X and still end up with AT&T as a provider. Sorry.

I had the situation described above, AT&T irked me and I switched and the result was AT&T DSL with another brand name slapped on.

So tech support and billing questions moved extra-slow, because I had to submit requests to the people taking my money, and they would relay the queries to AT&T.

@Nullo What part of the country are you in?
When ISP’s were starting local presence, they were awarded as sole provider at a town level.
This has changed a bit, but in much of the country, you don’t have much to pick from.
Most High Speed ISP’s are also capping their usage. This will become their next revenue stream as more and more content (streaming video, etc) is provided over the wire.

Keep in mind that your ISP is performing a different role than is the provider of your physical line. In my example, Frontier is providing me a line and a carrier signal- covering the first two layers of the OSI model. Your ISP provides at least layer 3 and sometimes additional services. They can be the same company but need not be.
As @blueiiznh states, the physical / link layer providers have local monopolies in some areas. As far as I know this has never been true of ISPs.

Thanks for the responses.
I am in Missouri, in the St. Louis area. AT&T owns the lines (they used to belong to SBC Global), and I have subscribed to DSL through them.