Brookings Institution
"Tracking deregulation in the Trump era"
There is a huge number of them.
Here are a few I found to be of greatest significance.Clean Power Plan (Coal Plants)
Endangered Species Act: Rule Revisions
Designating undocumented immigrants for expedited removal
State "Empowerment Waivers" for the Affordable Care Act
Title X funding revision regarding clinics providing abortions
Waters of the U.S. Rule (WOTUS)
Religious and Moral Exemptions from Contraceptive Coverage Mandates
Fuel Economy Standards for Model Year 2022-2025 Passenger Vehicles
Methane and Waste Prevention Rule
Net Neutrality
Scientific Transparency Rule
Title IX Guidances on Transgender Student Rights
I urge you to follow the link above if you're interested. It has the dates and explanations of each. Some of changes are good. Some bad depending on your point of view.