Tamper Data is described as 'Firefox add-on that lets you change headers and request parameters before they're sent to the server' and is an app in the Web Browsers category. There are nine alternatives to Tamper Data for a variety of platforms, including Windows, Linux, Online / Web-based, Mac and Chrome OS. The best alternative is Burp Suite, which is free. Other great apps like Tamper Data are OWASP Zed Attack Proxy (ZAP) (Free, Open Source), w3af (Free, Open Source), Acunetix (Paid) and Websecurify (Paid).
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Ammonite is a web application security scanner extension for Fiddler. Ammonite detects common vulnerabilities such as SQL injection, OS command injection, cross-site scripting, file inclusion, format string vulnerabilities, and buffer overflows.