Sentry JavaScript Error Monitoring Alternatives

Fiddler is a debugging program for websites.

Deployment, Defacement, & Security Monitoring

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Firefox JavaScript Debugger is a rich-functional website monitoring tool that provides you an opportunity to step through JavaScript code and test or modify its state, helping in tracing the bugs from all over the network.

Inspect Element is a multi-functional tool that is introduced to get information about what makes the web tick, figure out what is broken in your sites, and mock-up what a specific color or font change would look like.

Firefox Page Inspector is a multi-featured tool that allows you to navigate through the components that go into rendering their pages, enabling you to achieve better performance, find bugs and check mobile views, and many others.

The most advanced tools for tracking changes on websites.

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

Open Source

HTTP proxy / HTTP monitor / Reverse Proxy

TypeScript allows developers to compile a superset of JavaScript to plain JavaScript on any browser, host, or operating system.

Open Source

Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.

Jan 1, 2018 - A powerful replacement for the macOS / OS X Terminal, with 24-bit color and graphics features.

Open Source

Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more

Popular free terminal application. Mostly used as an SSH client.