Most Massachusetts town vital records for birth/marriage/death before 1850 can be accessed free at archive.org but finding them may be difficult, due to a difficult search procedure. It is easier to go to Google or DuckDuckGo and enter a search on, say, Plymouth Vital Records, and pick the one hosted by archive.org
Similar information is available free at familysearch.org with a free membership. Also, americanancesters.org provides the Massachusetts VR lookups without requiring any membership.