Fiddler

Fiddler is a debugging program for websites.

18 Alternatives To Fiddler

Bugzilla

Bugzilla is a “Defect Tracking System” or “Bug-Tracking System”.

Charles

HTTP proxy / HTTP monitor / Reverse Proxy
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HTTP Debugger

Debug HTTP API calls to a back-end and between back-ends. Easy of use, clean UI, and short ramp-up time. Not a proxy, no network issues!

HTTP Toolkit

Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, CLI tools, scripts and more.

Instabug

The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.
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Jira

The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software. Jira Software supports any agile project management methodology for software development Jira Software is an agile project management tool that supports any agile methodology, be it scrum, kanban, or your own unique flavor.

Lookout

Lookout is a cybersecurity company that predicts and stops mobile attacks before harm is done to an individual or an enterprise.

NetworkMiner

NetworkMiner is a Network Forensic Analysis Tool (NFAT) for Windows.
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PVS-Studio

PVS-Studio is a useful piece of software for detecting problems in source code. The software examines program codes written in C, C++, and C# for any problems that might prohibit the code from functioning properly.

Postman Collections

Biggest library of ready-made API collections for Postman

Proxyman

An modern and intuitive HTTP debugging proxy on macOS & iOS https://proxyman.io
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Shodan

Shodan is the world’s first search engine for Internet-connected devices.

Sublime Web Inspector

Sublime Web Inspector enables users to debug Javascript right in the Sublime Text editor.
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Wireshark

Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.

Xpediter

Xpediter is a mainframe application interactive debugging tool. It also offers code coverage for mainframe application analysis.

Zed Attack Proxy

The Zed Attack Proxy (ZAP) is an easy to use integrated penetration testing tool for finding…

mitmproxy

mitmproxy is an SSL-capable man-in-the-middle proxy for HTTP.
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tcpdump

tcpdump is a common packet analyzer that runs under the command line.