Chad Bird's new web page. Chad is a gifted teacher of the church (LCMS) who has hundreds of resources, including articles and videos, freely available here.
For other free resources see the column of links on the right. If there are helpful resource sites you use please let me know so that I may assess them.
Meanwhile, check out the 19th C. study pictured at left (looks like a picture of C.F.W. Walther's study I once saw - contrary to claims that Walther embodied a narrow culture he was actually a very well read man)...while digitisation drastically reduces the number of books required for a theological library in comparison with a hundred years ago, in my experience there remains the problem of software platforms being rather quickly superseded, thus rendering digital resources unusable.
A blessed Christmas season to readers!