Burp Suite (PortSwigger) is the dominant web application security testing platform. The free Community edition gives you Proxy, Repeater, Decoder, Comparer; Professional adds the active scanner and Intruder at full speed.
Core tools relevant to the exam:
- Proxy — intercept and modify HTTP(S) traffic between browser and server.
- Repeater — replay and tweak a single request.
- Intruder — automated payload-based attacks (fuzzing, brute-force).
- Scanner (Pro) — automated detection of OWASP Top 10 issues.
- Collaborator (Pro) — out-of-band detection for blind XXE/SSRF.