Offensive Security Guide.
--> General/Basic Exploitation
http://www.pentest-standard.org/index.php/Main_Page
https://www.offensive-security.com/metasploit-unleashed/
http://null-byte.wonderhowto.com/how-to/metasploit-basics/
https://www.owasp.org/index.php/Main_Page
https://github.com/nixawk/pentest-wiki
https://github.com/beefproject/beef
https://portswigger.net/burp/
https://www.metasploit.com/
http://exploitpack.com/
https://github.com/commixproject/commix
https://github.com/reverse-shell/routersploit
--> Distros
https://www.kali.org/
https://www.blackarch.org/
https://www.parrotsec.org/
--> Vulnscanner/Sniffer/Tools/Web Exploitation
http://www.askapache.com/security/computer-security-toolbox-2/#common_security_programs
https://pastebin.com/kP04r4PM
http://www.irongeek.com/i.php?page=backtrack-r1-man-pages/netdiscover
http://www.tenable.com/products/nessus-vulnerability-scanner
https://www.rapid7.com/products/nexpose/
https://cirt.net/nikto2
https://nmap.org/
https://github.com/netsniff-ng/netsniff-ng
https://www.wireshark.org/
https://github.com/fwaeytens/dnsenum/
https://github.com/makefu/dnsmap/
http://www.tcpdump.org/
http://sqlmap.org/
https://www.owasp.org/index.php/Category:OWASP_Joomla_Vulnerability_Scanner_Project
https://wpscan.org/
http://networksecuritytoolkit.org/nst/index.html
https://github.com/droope/droopescan
https://github.com/andresriancho/w3af
https://www.netsparker.com/
--> Password Cracker
http://www.openwall.com/john/
http://hashcat.net/hashcat/
--> Online Tools
http://crackstation.net
http://www.tcpiputils.com/
https://shodan.io
--> Exploits (Exploit/Vulnerability Databases)
https://exploit-db.com/
http://kernel-exploits.com
https://github.com/PenturaLabs/Linux_Exploit_Suggester
https://nvd.nist.gov/
https://www.us-cert.gov/
https://blog.osvdb.org/
http://www.securityfocus.com/
http://seclists.org/fulldisclosure/
https://technet.microsoft.com/en-us/security/bulletins
https://technet.microsoft.com/en-us/security/advisories
https://packetstormsecurity.com/
http://www.securiteam.com/
http://cxsecurity.com/
https://www.vulnerability-lab.com/
--> Payloads/Reverse Shells
https://www.veil-framework.com/framework/veil-evasion/
http://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet
https://highon.coffee/blog/reverse-shell-cheat-sheet/
--> Info/Blogs/Techniques/etc
http://wiki.bash-hackers.org/scripting/style
https://www.corelan.be/index.php/articles/
https://www.veracode.com/security/xss
http://www.thegeekstuff.com/2012/02/xss-attack-examples/
https://blog.g0tmi1k.com/2011/08/basic-linux-privilege-escalation/
https://thehackernews.com/
http://securityidiots.com/Web-Pentest/SQL-Injection/Basic-Union-Based-SQL-Injection.html
https://www.idontplaydarts.com/2011/02/using-php-filter-for-local-file-inclusion/
https://hakin9.org/voip-hacking-techniques/