
Avast Software s.r.o. is a Czech multinational cybersecurity software company headquartered in Prague, Czech Republic that researches and develops computer security software, machine learning and artificial intelligence. Avast has more than 435 million monthly active users and the second largest market share among anti-malware application vendors worldwide as of April 2020. The company has approximately 1,700 employees across its 25 offices worldwide. In August 2021, the company's board agreed an offer from NortonLifeLock to acquire the company for US$8 billion.

Avast Antivirus is a family of cross-platform internet security applications developed by Avast for Microsoft Windows, macOS, Android and iOS. The Avast Antivirus products include freeware and paid versions that provide computer security, browser security, antivirus software, firewall, anti-phishing, antispyware, and anti-spam among other services.

Clam AntiVirus (ClamAV) is a free software, cross-platform and open-source antivirus software toolkit able to detect many types of malicious software, including viruses. One of its main uses is on mail servers as a server-side email virus scanner. The application was developed for Unix and has third party versions available for AIX, BSD, HP-UX, Linux, macOS, OpenVMS, OSF (Tru64) and Solaris. As of version 0.97.5, ClamAV builds and runs on Microsoft Windows. Both ClamAV and its updates are made available free of charge.

Deep Freeze, by Faronics, is a reboot to restore software application available for the Microsoft Windows, and macOS operating systems which allows system administrators to protect the core operating system and configuration files on a workstation or server by restoring a computer back to the saved configuration, each time the computer is restarted.

Enigmail is a data encryption and decryption extension for Mozilla Thunderbird and the Postbox that provides OpenPGP public key e-mail encryption and signing. Enigmail works under Microsoft Windows, Unix-like, and Mac OS X operating systems. Enigmail can operate with other mail clients compatible with PGP/MIME and inline PGP such as: Microsoft Outlook with Gpg4win package installed, Gnome Evolution, KMail, Claws Mail, Gnus, Mutt. Its cryptographic functionality is handled by GNU Privacy Guard.

ESET NOD32 Antivirus, commonly known as NOD32, is an antivirus software package made by the Slovak company ESET. ESET NOD32 Antivirus is sold in two editions, Home Edition and Business Edition. The Business Edition packages add ESET Remote Administrator allowing for server deployment and management, mirroring of threat signature database updates and the ability to install on Microsoft Windows Server operating systems.

G Data CyberDefense AG is a German software company that focuses on computer security. The company was founded in 1985 and is headquartered in Bochum. They are known for being the creators of the world's first antivirus software. G Data use multiple scanning engines; one is developed in-house and the other is the Bitdefender engine. G Data provides several security products that are targeted at home and business markets. The company has a North American subsidiary located in Newark, Delaware.

GPG Mail is an extension for Apple Mail which comes as part of GPG Suite, a software collection that provides easy access to a collection of tools designed to secure your communications and encrypt files. GPG Mail provides public key email encryption and signing. It integrates with the default email client Apple Mail under macOS and the actual cryptographic functionality is handled by GNU Privacy Guard.

inSSIDer is a Wi-Fi network scanner application for Microsoft Windows and OS X developed by MetaGeek, LLC. It has received awards such as a 2008 Infoworld Bossie Award for "Best of Open Source Software in Networking", but as of inSSIDer 3, it is no longer open-source.

Kaspersky Anti-Virus is a proprietary antivirus program developed by Kaspersky Lab. It is designed to protect users from malware and is primarily designed for computers running Microsoft Windows and macOS, although a version for Linux is available for business consumers.

Kaspersky Internet Security is an internet security suite developed by Kaspersky Lab compatible with Microsoft Windows and Mac OS X. KIS offers protection from malware, as well as email spam, phishing and hacking attempts, and data leaks. Kaspersky Lab Diagnostics results are distributed to relevant developers through the MIT License.

GNU Privacy Guard is a free-software replacement for Symantec's PGP cryptographic software suite. It is compliant with RFC 4880, the IETF standards-track specification of OpenPGP. Modern versions of PGP are interoperable with GnuPG and other OpenPGP-compliant systems.

MacKeeper is utility software distributed by Clario Tech Limited. MacKeepers was developed by ZeoBIT and is presently distributed by Clario Tech. The first beta version was released on 13 May 2010. It is designed to operate on computers running macOS. It is known for being heavily promoted through aggressive advertising and affiliate marketing. MacKeeper faced a class-action lawsuit because the company allegedly deceived users into paying for unneeded fixes. The lawsuit was settled in 2014 for US $2 million without any admission of guilt by the company. According to MacWorld, it is difficult to uninstall and does not behave like a respectable app.

MacScan is anti-malware software for macOS developed by SecureMac.

The Metasploit Project is a computer security project that provides information about security vulnerabilities and aids in penetration testing and IDS signature development. It is owned by Boston, Massachusetts-based security company Rapid7.

ngrep is a network packet analyzer written by Jordan Ritter. It has a command-line interface, and relies upon the pcap library and the GNU regex library.

Symantec Endpoint Protection, developed by Broadcom Inc., is a security software suite that consists of anti-malware, intrusion prevention and firewall features for server and desktop computers. It has the largest market-share of any product for endpoint security.

VeraCrypt is a source-available freeware utility used for on-the-fly encryption (OTFE). The software can create a virtual encrypted disk that works just like a regular disk but within a file It can also encrypt a partition or the entire storage device with pre-boot authentication.