This page contains several primary-source documents, including original grants and charters from the 17th century. You've got your Massachusetts Charter of 1691, several other charters, and the English Bill of Rights (1689), plus way more.

Walk through the hysteria of Salem's witch hunts with this interactive National Geographic tool.

This website describes and contextualizes a 17th-century witchcraft accusation in Massachusetts, and includes images of original documents with transcriptions, photographs of period homes, maps, and some portraits. From the site: 

Mary Parsons is perhaps the most infamous resident of Northampton's early settlement period. She was involved in witchcraft-related trials in 1656 and 1674, and possibly again in 1679. Her story is a fascinating one that sheds light on the workings of the Puritan mind and the complicated social and cultural situation of the period.