🔸 PuTTY – is an SSH and telnet client, developed originally by Simon Tatham.
🔸 Mosh – is a SSH wrapper designed to keep a SSH session alive over a volatile connection.
🔸 Eternal Terminal – enables mouse-scrolling and tmux commands inside the SSH session.
🔸 nmap – is a free and open source (license) utility for network discovery and security auditing.
🔸 zmap – is a fast single packet network scanner designed for Internet-wide network surveys.
🔸 Rust Scan – to find all open ports faster than Nmap.
🔸 masscan – is the fastest Internet port scanner, spews SYN packets asynchronously.
🔸 pbscan – is a faster and more efficient stateless SYN scanner and banner grabber.
🔸 hping – is a command-line oriented TCP/IP packet assembler/analyzer.
🔸 mtr – is a tool that combines the functionality of the ‘traceroute’ and ‘ping’ programs in a single tool.
🔸 mylg – utility which combines the functions of the different network probes in one diagnostic tool.
🔸 netcat – utility which reads and writes data across network connections, using the TCP/IP protocol.
🔸 tcpdump – is a powerful command-line packet analyzer.
🔸 tshark – is a tool that allows us to dump and analyze network traffic (wireshark cli).
🔸 Termshark – is a simple terminal user-interface for tshark.
🔸 ngrep – is like GNU grep applied to the network layer.
🔸 netsniff-ng – is a Swiss army knife for your daily Linux network plumbing if you will.
🔸 sockdump – dump unix domain socket traffic.
🔸 stenographer – is a packet capture solution which aims to quickly spool all packets to disk.
🔸 tcpterm – visualize packets in TUI.
🔸 bmon – is a monitoring and debugging tool to capture networking related statistics and prepare them visually.
🔸 iptraf-ng – is a console-based network monitoring program for Linux that displays information about IP traffic.
🔸 vnstat – is a network traffic monitor for Linux and BSD.
🔸 iPerf3 – is a tool for active measurements of the maximum achievable bandwidth on IP networks.
🔸 ethr – is a Network Performance Measurement Tool for TCP, UDP & HTTP.
🔸 Etherate – is a Linux CLI based Ethernet and MPLS traffic testing tool.
🔸 echoip – is a IP address lookup service.
🔸 Nemesis – packet manipulation CLI tool; craft and inject packets of several protocols.
🔸 packetfu – a mid-level packet manipulation library for Ruby.
🔸 Scapy – packet manipulation library; forge, send, decode, capture packets of a wide number of protocols.
🔸 impacket – is a collection of Python classes for working with network protocols.
🔸 ssh-audit – is a tool for SSH server auditing.
🔸 aria2 – is a lightweight multi-protocol & multi-source command-line download utility.
🔸 iptables-tracer – observe the path of packets through the iptables chains.
🔸 inception – a highly configurable tool to check for whatever you like against any number of hosts.
🔸 dnsdiag – is a DNS diagnostics and performance measurement tools.
🔸 fierce – is a DNS reconnaissance tool for locating non-contiguous IP space.
🔸 subfinder – is a subdomain discovery tool that discovers valid subdomains for websites.
🔸 sublist3r – is a fast subdomains enumeration tool for penetration testers.
🔸 amass – is tool that obtains subdomain names by scraping data sources, crawling web archives, and more.
🔸 namebench – provides personalized DNS server recommendations based on your browsing history.
🔸 massdns – is a high-performance DNS stub resolver for bulk lookups and reconnaissance.
🔸 knock – is a tool to enumerate subdomains on a target domain through a wordlist.
🔸 dnsperf – DNS performance testing tools.
🔸 dnscrypt-proxy 2 – a flexible DNS proxy, with support for encrypted DNS protocols.
🔸 dnsdbq – API client providing access to passive DNS database systems.
🔸 grimd – fast dns proxy, built to black-hole internet advertisements and malware servers.
🔸 curl – is a command line tool and library for transferring data with URLs.
🔸 kurly – is an alternative to the widely popular curl program, written in Golang.
🔸 HTTPie – is an user-friendly HTTP client.
🔸 wuzz – is an interactive cli tool for HTTP inspection.
🔸 h2spec – is a conformance testing tool for HTTP/2 implementation.
🔸 h2t – is a simple tool to help sysadmins to hardening their websites.
🔸 htrace.sh – is a simple Swiss Army knife for http/https troubleshooting and profiling.
🔸 httpstat – is a tool that visualizes curl statistics in a way of beauty and clarity.
🔸 httplab – is an interactive web server.
🔸 Lynx – is a text browser for the World Wide Web.
🔸 Browsh – is a fully interactive, real-time, and modern text-based browser.
🔸 HeadlessBrowsers – a list of (almost) all headless web browsers in existence.
🔸 ab – is a single-threaded command line tool for measuring the performance of HTTP web servers.
🔸 siege – is an http load testing and benchmarking utility.
🔸 wrk – is a modern HTTP benchmarking tool capable of generating significant load.
🔸 wrk2 – is a constant throughput, correct latency recording variant of wrk.
🔸 vegeta – is a constant throughput, correct latency recording variant of wrk.
🔸 bombardier – is a fast cross-platform HTTP benchmarking tool written in Go.
🔸 gobench – http/https load testing and benchmarking tool.
🔸 hey – HTTP load generator, ApacheBench (ab) replacement, formerly known as rakyll/boom.
🔸 boom – is a script you can use to quickly smoke-test your web app deployment.
🔸 SlowHTTPTest – is a tool that simulates some Application Layer Denial of Service attacks by prolonging HTTP.
🔸 gobuster – is a free and open source directory/file & DNS busting tool written in Go.
🔸 ssllabs-scan – command-line reference-implementation client for SSL Labs APIs.
🔸 http-observatory – Mozilla HTTP Observatory cli version.
🔸 openssl – is a robust, commercial-grade, and full-featured toolkit for the TLS and SSL protocols.
🔸 gnutls-cli – client program to set up a TLS connection to some other computer.
🔸 sslyze – fast and powerful SSL/TLS server scanning library.
🔸 sslscan – tests SSL/TLS enabled services to discover supported cipher suites.
🔸 testssl.sh – testing TLS/SSL encryption anywhere on any port.
🔸 cipherscan – a very simple way to find out which SSL ciphersuites are supported by a target.
🔸 spiped – is a utility for creating symmetrically encrypted and authenticated pipes between socket addresses.
🔸 Certbot – is EFF’s tool to obtain certs from Let’s Encrypt and (optionally) auto-enable HTTPS on your server.
🔸 mkcert – simple zero-config tool to make locally trusted development certificates with any names you’d like.
🔸 certstrap – tools to bootstrap CAs, certificate requests, and signed certificates.
🔸 Sublert – is a security and reconnaissance tool to automatically monitor new subdomains.
🔸 mkchain – open source tool to help you build a valid SSL certificate chain.
🔸 SELinux – provides a flexible Mandatory Access Control (MAC) system built into the Linux kernel.
🔸 AppArmor – proactively protects the operating system and applications from external or internal threats.
🔸 grapheneX – Automated System Hardening Framework.
🔸 DevSec Hardening Framework – Security + DevOps: Automatic Server Hardening.
🔸 Wireshark – is the world’s foremost and widely-used network protocol analyzer.
🔸 Ettercap – is a comprehensive network monitor tool.
🔸 EtherApe – is a graphical network monitoring solution.
🔸 Packet Sender – is a networking utility for packet generation and built-in UDP/TCP/SSL client and servers.
🔸 Ostinato – is a packet crafter and traffic generator.
🔸 JMeter™ – open source software to load test functional behavior and measure performance.
🔸 locust – scalable user load testing tool written in Python.
🔸 SSL/TLS Capabilities of Your Browser – test your browser’s SSL implementation.
🔸 Can I use – provides up-to-date browser support tables for support of front-end web technologies.
🔸 Panopticlick 3.0 – is your browser safe against tracking?
🔸 Privacy Analyzer – see what data is exposed from your browser.
🔸 Web Browser Security – it’s all about Web Browser fingerprinting.
🔸 How’s My SSL? – help a web server developer learn what real world TLS clients were capable of.
🔸 sslClientInfo – client test (incl TLSv1.3 information).
🔸 SSLLabs Server Test – performs a deep analysis of the configuration of any SSL web server.
🔸 SSLLabs Server Test (DEV) – performs a deep analysis of the configuration of any SSL web server.
🔸 ImmuniWeb® SSLScan – test SSL/TLS (PCI DSS, HIPAA and NIST).
🔸 SSL Check – scan your website for non-secure content.
🔸 SSL Scanner – analyze website security.
🔸 CryptCheck – test your TLS server configuration (e.g. ciphers).
🔸 urlscan.io – service to scan and analyse websites.
🔸 Report URI – monitoring security policies like CSP and HPKP.
🔸 CSP Evaluator – allows developers and security experts to check if a Content Security Policy.
🔸 Useless CSP – public list about CSP in some big players (might make them care a bit more).
🔸 Why No HTTPS? – top 100 websites by Alexa rank not automatically redirecting insecure requests.
🔸 TLS Cipher Suite Search– cipher suite search engine.
🔸 cipherli.st – strong ciphers for Apache, Nginx, Lighttpd, and more.*
🔸 dhtool – public Diffie-Hellman parameter service/tool.
🔸 badssl.com – memorable site for testing clients against bad SSL configs.
🔸 tlsfun.de – registered for various tests regarding the TLS/SSL protocol.
🔸 CAA Record Helper – generate a CAA policy.
🔸 Common CA Database – repository of information about CAs, and their root and intermediate certificates.
🔸 CERTSTREAM – real-time certificate transparency log update stream.
🔸 crt.sh – discovers certificates by continually monitoring all of the publicly known CT.
🔸 Hardenize – deploy the security standards.
🔸 Cipher suite compatibility – test TLS cipher suite compatibility.
🔸 urlvoid – this service helps you detect potentially malicious websites.
🔸 security.txt – a proposed standard (generator) which allows websites to define security policies.
🔸 ssl-config-generator – help you follow the Mozilla Server Side TLS configuration guidelines.
HTTP Headers & Web Linters
🔸 Security Headers – analyse the HTTP response headers (with rating system to the results).
🔸 Observatory by Mozilla – set of tools to analyze your website.
🔸 webhint – is a linting tool that will help you with your site’s accessibility, speed, security, and more.
🔸 ViewDNS – one source for free DNS related tools and information.
🔸 DNSLookup – is an advanced DNS lookup tool.
🔸 DNSlytics – online DNS investigation tool.
🔸 DNS Spy – monitor, validate and verify your DNS configurations.
🔸 Zonemaster – helps you to control how your DNS works.
🔸 Leaf DNS – comprehensive DNS tester.
🔸 Find subdomains online – find subdomains for security assessment penetration test.
🔸 DNSdumpster – dns recon & research, find & lookup dns records.
🔸 DNS Table online – search for DNS records by domain, IP, CIDR, ISP.
🔸 intoDNS – DNS and mail server health checker.
🔸 DNS Bajaj – check the delegation of your domain.
🔸 BuddyDNS Delegation LAB – check, trace and visualize delegation of your domain.
🔸 dnssec-debugger – DS or DNSKEY records validator.
🔸 PTRarchive.com – this site is responsible for the safekeeping of historical reverse DNS records.
🔸 xip.io – wildcard DNS for everyone.
🔸 nip.io – dead simple wildcard DNS for any IP Address.
🔸 dnslookup (ceipam) – one of the best DNS propagation checker (and not only).
🔸 What’s My DNS – DNS propagation checking tool.
🔸 DNSGrep – quickly searching large DNS datasets.
🔸 Netcraft – detailed report about the site, helping you to make informed choices about their integrity.*
🔸 RIPE NCC Atlas – a global, open, distributed Internet measurement platform.
🔸 Robtex – uses various sources to gather public information about IP numbers, domain names, host names, etc.
🔸 Security Trails – APIs for Security Companies, Researchers and Teams.
🔸 Online Curl – curl test, analyze HTTP Response Headers.
🔸 Online Tools for Developers – HTTP API tools, testers, encoders, converters, formatters, and other tools.
🔸 Ping.eu – online Ping, Traceroute, DNS lookup, WHOIS and others.
🔸 Network-Tools – network tools for webmasters, IT technicians & geeks.
🔸 BGPview – search for any ASN, IP, Prefix or Resource name.
🔸 Is BGP safe yet? – check BGP (RPKI) security of ISPs and other major Internet players.
🔸 Riseup – provides online communication tools for people and groups working on liberatory social change.
🔸 VirusTotal – analyze suspicious files and URLs to detect types of malware.
🔸 privacytools.io – provides knowledge and tools to protect your privacy against global mass surveillance.
🔸 DNS Privacy Test Servers – DNS privacy recursive servers list (with a ‘no logging’ policy).
Encoders/Decoders and Regex testing
🔸 URL Encode/Decode – tool from above to either encode or decode a string of text.
🔸 Uncoder – the online translator for search queries on log data.
🔸 RegExr – online tool to learn, build, & test Regular Expressions (RegEx / RegExp).
🔸 RegEx Testing – online regex testing tool.
🔸 RegEx Pal – online regex testing tool + other tools.
🔸 The Cyber Swiss Army Knife – a web app for encryption, encoding, compression and data analysis
🔸 have i been pwned? – check if you have an account that has been compromised in a data breach.
🔸 dehashed – is a hacked database search engine.
🔸 Leaked Source – is a collaboration of data found online in the form of a lookup.
🔸 CVE Mitre – list of publicly known cybersecurity vulnerabilities.
🔸 CVE Details – CVE security vulnerability advanced database.
🔸 Exploit DB – CVE compliant archive of public exploits and corresponding vulnerable software.
🔸 0day.today – exploits market provides you the possibility to buy/sell zero-day exploits.
🔸 sploitus – the exploit and tools database.
🔸 cxsecurity – free vulnerability database.
🔸 Vulncode-DB – is a database for vulnerabilities and their corresponding source code if available.
🔸 cveapi – free API for CVE data.
🔸 Keybase – it’s open source and powered by public-key cryptography.
🔸 SKS OpenPGP Key server – services for the SKS keyservers used by OpenPGP.
🔸 Varnish Cache – HTTP accelerator designed for content-heavy dynamic web sites.
🔸 Nginx – open source web and reverse proxy server that is similar to Apache, but very light weight.
🔸 OpenResty – is a dynamic web platform based on NGINX and LuaJIT.
🔸 Tengine – a distribution of Nginx with some advanced features.
🔸 Caddy Server – is an open source, HTTP/2-enabled web server with HTTPS by default.
🔸 HAProxy – the reliable, high performance TCP/HTTP load balancer.
🔸 Unbound – validating, recursive, and caching DNS resolver (with TLS).
🔸 Knot Resolver – caching full resolver implementation, including both a resolver library and a daemon.
🔸 PowerDNS – is an open source authoritative DNS server, written in C++ and licensed under the GPL.
🔸 3proxy – tiny free proxy server.
🔸 Emerald Onion – is a 501(c)(3) nonprofit organization and transit internet service provider (ISP).
🔸 pi-hole – the Pi-hole® is a DNS sinkhole that protects your devices from unwanted content.
🔸 maltrail – malicious traffic detection system.
🔸 security_monkey – monitors AWS, GCP, OpenStack, and GitHub orgs for assets and their changes over time.
🔸 firecracker – secure and fast microVMs for serverless computing.
🔸 streisand – sets up a new server running your choice of WireGuard, OpenSSH, OpenVPN, and more.
🔸 NRE Labs – learn automation by doing it. Right now, right here, in your browser.
🔸 LBNL’s Network Research Group – home page of the Network Research Group (NRG).