Not quite a change log but something we've found useful with our clients is https://shippingreport.com https://shippingreport.com It uses PR messages to make a

Not quite a change log but something we've found useful with our clients is https://shippingreport.com https://shippingreport.com It uses PR messages to make a report of what changed. If your PR messages are nice (we use animated gifs to demo changes) then you end up with some really nice reports.