In August of 2022, the White House Office of Science and Technology Policy (OSTP), it updated its guidelines to make the results of taxpayer-supported research immediately available to the public at no cost.
To read the memo, visit the OSTP Public Access memo.
This list of federal agencies with research and development expenditures were subject to the OSTP's memo. Here, you can see each agencies response and its plans to how they will fulfill the OSTP memo's requirements.
There are hundreds of readings and resources on open access. In addition, you can search for related terms such as "open science," or "open data."