Ranked in these QuestionsQuestion Ranking
Pro Firebug-Lite integration
Windmill comes integrated with Firebug-Lite, a lightweight version of the hugely popular debugging tool.
Pro Test recorder for all browser platforms
Windmill's test recorder allows recording test cases on any platform and all major browsers.
Con Less activity on Windmill codebase
Low activity on the main github repository shows that the community around it is shrinking and there's a decrease in developer activity. Usually this implies that the tool is in a not very good & updated state. The issue tracker also doesn't evoke confidence.