Useful Links
Security Tools
BackTrack Linux(Deprecated and became Kali)Kali Linux - "a penetration testing distribution"
Security Onion - "free and open platform built by defenders for defenders"
Parrot OS - "arsenal of tools, utilities and libraries professionals can use to test and assess the security of their assets"
Network Security Toolkit - "best-of-breed Open Source Network Security Applications"
Pentoo - "security-focused livecd based on Gentoo"
Tails - "distribution aimed at preserving privacy and anonymity against surveillance"
Security Magazine - "The business magazine for security executives"
Secure Computing Magazine - "Cybersecurity News, Awards, Webinars, eSummmits and Research"
TechTarget Search Security - "Security Information, News and Tips"
CSO Online - Security and Risk - "Critical information to stay ahead of evolving threats and defend against criminal cyberattacks"
Krebs on Security - "In-depth security news and investigation""
Cloud Providers
Critical Software - Mail, VPN, Encryption, Firewall, Anti-Virus, Messaging
Proton Mail free end-to-end encrypted email service operated by Swiss company Proton AG
Proton Drive free end-to-end encrypted storage operated by Swiss company Proton AG
ProtonVPN free VPN service operated by Swiss company Proton AG
WireGuard VPN - "simple, fast and modern VPN that utilizes state-of-the-art cryptography"
OpenVPN - "versatile standards-based VPN client and tunneling software"
ExpressVPN - commercial VPN service provider with leading encryption
TrueCrypt(Deprecated)VeraCrypt - TrueCrypt fork "open-source utility for on-the-fly encryption"
Tomb - minimalistic command line tool based on Linux dm-crypt and LUKS
GnuPG - complete and free implementation of the OpenPGP standard allows you to encrypt and sign your data and communications
OpenPGP - non-proprietary format for authenticating or encrypting data, using public key cryptography and the most widely used email encryption standard
ZoneAlarm Free Firewall - a Check Point company - "Protect your PC with the world’s best firewall solution" for Windows
ZoneAlarm Free Antivirus - a Check Point company - "Secure yourself with a robust antivirus solution and the world’s best firewall" for Windows
AVG AntiVirus Free - "Award-winning free antivirus" for Windows, Mac, iOS and Android
Bitdefender Antivirus - Antivirus protection for Windows, Mac and Android
ClamAV Antivirus - "open-source antivirus engine for detecting trojans, viruses, malware & other malicious threats"
Adaware Antivirus - "stay protected while searching & surfing the web"
Pidgin - multi-protocol (AIM, MSN, Yahoo!, ICQ, Jabber, XMPP, SameTime) chat with optional encryption
Signal - "State-of-the-art end-to-end encryption keeps your conversations secure"
Session - "end-to-end encrypted messenger that minimises sensitive metadata"
Utilities & Live CD's
Ventoy - open source tool to create bootable USB drive for ISO/WIM/IMG/VHD(x)/EFI files
Netboot.xyz - boot into many types of operating systems using lightweight tooling
Sytem Rescue CD - Linux-based Linux system rescue toolkit
Gnome Partition Editor - free partition editor for graphically managing your disk partitions
Parted Magic - commercial hard disk management solution
TrueNAS (Formerly FreeNAS) - free and commercial software-defined storage
pfSense - free network firewall distribution, based on the FreeBSD operating system
IPFire - Open Source Linux-based Firewall Operating System with a Comprehensive Feature Set
Knoppix - bootable Live system on CD, DVD or USB flash drives
PC Linux OS - free easy to use Linux-based Operating System
Monitoring & Automation
Netdata - monitor your entire infrastructure in high-resolutio and in real-time
Homebridge - integrate with smart home devices that do not natively support HomeKit
Home Assistant - Open source home automation that puts local control and privacy first
Linux Documentation
Crypto
Music and Media
Miscellaneous
More coming soon...