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Open-source email alias service for receiving and replying without exposing a personal address, with apps, extensions, custom domains, and self-hosting support.

Dutch private email service with no advertising or profiling, unlimited aliases, spam protection, and PGP or password-protected messages.

Open source email verification service for checking syntax, MX records, and deliverability through an API.

Binary Ninja supports reverse engineering, malware analysis, file inspection, or security research workflows.

CheckFileType supports reverse engineering, malware analysis, file inspection, or security research workflows.

ColorHexa

colorhexa.com

ColorHexa supports reverse engineering, malware analysis, file inspection, or security research workflows.

HexEd.it

hexed.it

HexEd.it supports reverse engineering, malware analysis, file inspection, or security research workflows.

Reverse image search and monitoring tool for finding copied images and possible infringement uses.

ImHex supports reverse engineering, malware analysis, file inspection, or security research workflows.

Unlimited Reverse DNS, Subdomain and Reverse CNAME lookups, also provides JSON APIs.

Reverse image search tool for finding reposted images and duplicate content on Reddit.

LemmeDebug supports reverse engineering, malware analysis, file inspection, or security research workflows.

OSINT.sh tool for finding websites connected by shared Google AdSense identifiers.

OSINT.sh tool for finding websites connected by shared Google Analytics tracking IDs.

OSINT.sh tool for finding domains and websites hosted on the same IP address.

OSINT.sh tool for finding domains that share the same mail exchanger records.

TinEye

tineye.com

Reverse image search engine for finding where an image appears online and tracking similar copies.

Web Version supports reverse engineering, malware analysis, file inspection, or security research workflows.

Yandex Images

yandex.com

Yandex image search for finding pictures, reverse image matches, visual references, and related pages.

CentralOps collection of DNS, WHOIS, traceroute, email, and network lookup tools.

Bitwarden Integration

bitwarden.com

Bitwarden Integration is an email utility for inbox management, privacy, aliases, extraction, or temporary mail.

Python tool for collecting email addresses from search engines and public web sources during authorized research.

Microsoft email and calendar service for personal, business, and web-based mail management.

10minemail.com provides temporary or disposable email addresses for quick signups and inbox testing.