A collection of 80 rare 17th century English Puritan works online free to read, many are from J.I. Packer's private library.
There are currently 80 Puritan authors in their collection, many of whose works were digitized from J. I. Packer’s private library.
http://blogs.thegospelcoalition.org/justintaylor/2016/01/12/j-i-packers-rare-puritan-library-now-digitized-to-be-read-online-for-free/