Apache httpd "combined" format logfile extractor. Not well documented yet, but it's got logical AND, OR, NOT expressions, with the variables constituting field string matches. Something like:

combined -L -e 'ipaddr~/10\..*/ && method=/GET/' access.log

https://github.com/bediger4000/combined

An HTTP mock server with a UI dashboard for changing responses on the fly. For example, for testing retries.

https://github.com/ericfortis/mockaton