Powerful friendly WebRTC mock peer & proxy
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MockRTCFree

Net-Tools.ioFree
free web app to perform functions like DNS lookups, port checks port scans, IP Information gathering, hash generation, blacklist checks, subnet calculation and more..
Manage and switch between multiple proxies quickly & easily.

FiddlerFree
By Telerik

Charles ProxyPaid with Free Trial
Web Debugging Proxy