Fiddler

Pros: I'm using fiddler to find the vulnerabilities of the application. We can perform penetration testing using fiddler and find several major security-related issues such as CSRF Attack, XSS Attack, SQL Injection, IDOR, Authentication & Authorization, File Upload, Password strength.
Fiddler provides a detailed overview of the application URLs and with status code and protocols.
We can quickly analyze the security test results by their priority and severity and export them.
Fiddler is a web debugging proxy tool and supports multiple proxies such as Firefox, Chrome, Safari, Internet explorer. We need to export the certificate by fiddler and import it on the browser's network settings section.

- Open-source penetration testing tool.
- It supports any client-server ar.
- Tracking cache, cookies & headers
- Traffic recording and playback mechanism
- Easy to learn and use it.
- Decrypt HTTP and HTTPS traffics
- Formation of any HTTP request feature
- Autoresponder & Inspection feature
- We can manipulate the sessions
- We can perform Load testing as well.
- It available in multiple flavors like Fiddler Everywhere, Fiddler Classic for Windows, FiddlerCore, and FiddlerCap.

Cons: No Cons. It is very useful for me during security testing. Thank you, Fiddler.

Overall: Fiddler is one of the best open-source applications to find the vulnerabilities of the application. Fiddler is based on client-server architecture.
Fiddler logs the traffic flowing between your computer and the internet. We can debug application traffic that supports proxy. Such applications include browsers like Chrome, Safari, Firefox, Opera, etc.
Fiddler has different versions like Fiddler Everywhere, Fiddler Classic for Windows, FiddlerCore, and FiddlerCap.
I am highly recommending it to security testers and developers.