The National Archives in the UK has an exciting new initiative. Called “Digital Microfilm,” it is PDF versions of microfilm reels that can be downloaded for free. The PDFs are quite large and the records have not been indexed so you will need to scroll through them, much as you would when using a microfilm. Nevertheless, this should greatly increase the utility of some of their most popular film.
Films are available from a variety of ministries and cover records from the mid-17th century through World War II. A complete list of available records is found here.