Maine Probate: website with contact information for every county's register of probate and probate court; court rules; court forms; etc.
Maine Statutes: source for Maine statutes (a.k.a. laws, legislation), including Title 18-A (Probate Code)
Department of Health and Human Services (DHHS): official website of Maine DHHS; useful information about a range of issues such as health care, elder care, and guardianships
Maine Revenue Service: official website of the Maine Revenue Service; useful information about State of Maine estate taxes; tax forms; etc.
Internal Revenue Service (IRS): official website of the IRS; useful information about federal estate and gift taxes; tax forms; etc.