Challenges

Name	Link
OverTheWire	https://overthewire.org/wargames/
Smash the Stack	https://smashthestack.org/wargames.html
Bright Shadows	http://bright-shadows.net
Hellbound Hackers	https://www.hellboundhackers.org/
HackThis	https://www.hackthis.co.uk/

Tools

DNS Recon

Name	Link
Altdns	https://github.com/infosec-au/altdns
AQUATONE	https://github.com/michenriksen/aquatone
CertStream	https://certstream.calidog.io/
DNSdumpster	https://dnsdumpster.com/
DNSRecon	https://github.com/darkoperator/dnsrecon
Domain Analyzer	https://github.com/eldraco/domain_analyzer
enumall	https://github.com/jhaddix/domain
Fierce	https://github.com/davidpepper/fierce-domain-scanner
ldns	https://www.nlnetlabs.nl/projects/ldns/
MassDNS	https://github.com/blechschmidt/massdns
nsec3map	https://github.com/anonion0/nsec3map
nsec3walker	https://dnscurve.org/nsec3walker.html
Sublist3r	https://github.com/aboul3la/Sublist3r
SubBrute	https://github.com/TheRook/subbrute
XRay	https://github.com/evilsocket/xray

File Sharing

Name	Link
Firefox Send	https://send.firefox.com/

IP Lookup

Name	Link
IPInfo.io	https://ipinfo.io/
IPIntel.io	https://ipintel.io/

Network

Name	Link
BGPView	https://bgpview.io/
HE BGP Toolkit	https://bgp.he.net/
Cymru ASN Lookup	https://asn.cymru.com/cgi-bin/whois.cgi

OSINT

Name	Link
theHarvester	https://github.com/laramies/theHarvester

Scanning

Name	Link
Nmap	https://nmap.org/

Search Engine

Name	Link
Censys	https://censys.io/
Certificate Search	https://crt.sh/
Shodan	https://www.shodan.io/

Web Applicaiton Security

API Testing

Name	Link
Insomnia	https://insomnia.rest/
Postman	https://www.getpostman.com

HTTP Proxy

Name	Link
Burp Suite	https://portswigger.net/burp
Charles Proxy	https://www.charlesproxy.com
Fiddler	https://www.telerik.com/fiddler
OWASP ZAP	https://github.com/zaproxy/zaproxy/wiki/Downloads