If you need to find a particular form and do not know what it is called, use a search engine. Often times, the IRS forms will be at the top of the page. The form finders on the practice centers certainly work, but its sometimes hard narrow in on the exact form that you need if your keywords are not on point.
Additionally, if you go to the Georgia State Low-Income Taxpayer Clinic website, you can use their tool search function. The available forms are tailored for use in a low income tax clinic, and they are often packaged as editable Microsoft Word documents with instructions on how to fill them out.
Common Publications and Forms:
Internal Revenue Service
U.S. Tax Court
Taxpayer Advocate Service