Depends completely on the type of testing you want to perform. Whether you are looking to find bugs on the front end or back end? Or are you looking for a tool that will help you perform chaos testing? There are a lot of strategies involved in finding bugs on any website. There are tools offering their services to help users implement these testing strategies well.
- Performance Testing tool - To check if the application is able to cope up with excessive traffic incoming. Example - Apache JMeter
- Cross Browser Testing tool - Helps you in finding bugs of a website across a variety of thousands of browsers running on real OS and different devices. Example - LambdaTest - You can also find bugs in RWD (Responsive Web Design) with their automated screenshots.
- VAPT tools- Vulnerability Assessment & Penetration Testing tools - To help you identify the soft spots in your website’s security. Example - Wireshark, NMAP etc.
- Bug Tracking Tools - Jira, Asana, Microsoft VSTS helps you to maintain a neat and clean library of all the bugs you found so you could collaborate and organize better with your teammates.