Take it like a gift

steghide
steghide

Steganography program that hides secrets in the least significant bits of a file.

findsecuritycontacts.com
findsecuritycontacts.com

Scans the top 500 sites daily for their security.txt file or DNS records.

dBmonster
dBmonster

A multitool for tracking and locating nearby devices via their RF activities.

JSgen
JSgen

Generate javascript code to be injected in case you find a Server Side Javascript Injection.

http-request-smuggling
http-request-smuggling

HTTP Request Smuggling Detection Tool.

ImHex
ImHex

Hex editor for reverse engineers, programmers and people who value their retinas when working at 3am.

AndroSet
AndroSet

Manage Burp Suite certificate in Android to redirect all traffic to Burp Suite.

graphql-voyager
graphql-voyager

Represent any GraphQL API as an interactive graph.

Flow
Flow

Provides view with filtering capabilities for all requests from all Burp Suite tools.

Linpmem
Linpmem

The Linux memory acquisition tool.

hakfindinternaldomains
hakfindinternaldomains

Feed it a list of subdomains, it will resolve them and tell you which ones are internal.

CTFR
CTFR

Abusing Certificate Transparency logs for getting HTTPS websites subdomains.

Apktool
Apktool

A tool for reverse engineering Android APK files.

CloudFlair
CloudFlair

Find origin servers of websites behind Cloudflare by using Internet-wide scan data from Censys.

Frida
Frida

Dynamic instrumentation toolkit for developers, reverse-engineers, and security researchers.