So you mainly want to avoid Intuit owned companies and H&R Block. They alone spent millions per year to lobby against easy and free filing for taxpayers.

Then there’s the ACTR (American Coalition Of Taxpayer Rights) who spend $100s of thousands a year lobbying for the same (and are made up by 14 members:

americancoalitionfortaxpayerrights.org/about/

Intuit

H&R Block