A resource I have enjoyed for years is Christian History Magazine. It has articles on a wide range of topics related to church history. Each issues has a particular focus on like an individual (e.g., John Newton), a Christian movement, or some other topic of interest. I eagerly bought the CD of all back issues when it came out some time ago.
Now all of the issues are available for free download. They have now posted all of their magazines so that they can be read for free online or downloaded as pdfs.
Before I give the links to the pdfs, I should mention how I download multiple files at the same time. Rather than clicking on each link and saving the files individually, I use a Firefox add-on that downloads all the files at once. The add-on I use is DownThemAll. Once I open it from my Tools menu, I select that I want it to download documents and then indicate the folder on my hard drive where I want them sent. I click “start” and the process takes off from there.
A list of back issues is here:
The pdf links are here:
The most recent issue pdfs:
Back Issue pdfs: