- RequetBin - http://requestb.in/
- NGrok - https://ngrok.com/
- Man In the Middle Proxy - http://mitmproxy.org/
- PostMan - http://getpostman.com/
- Hurl.it - http://www.hurl.it/
- PonyDebugger - https://github.com/square/PonyDebugger
Rails flash messages with AJAX requests