This is a list of free and open source security software (Antivirus, Firewall, password manager, antispyware...).

 

- Kaspersky Security Cloud – Free

Kaspersky Security Cloud – Free comes with top-rated security technologies – and auto-analyses real-time data on new threats – to help protect your PC, mobiles and tablets, including your iPad, from a range of dangers.

As a free antivirus scanner and cleaner, Kaspersky Security Cloud – Free software defends your PC and mobile devices, including your iPhone, against viruses, infected files, dangerous applications and suspicious sites.

Our security is designed to protect your devices – without getting in your way. And because Kaspersky Security Cloud – Free receives automatic updates, you can be sure your antivirus program is always up to date.

  • Guards you from viruses on your PC & Android devices
  • Secures & stores your passwords & private docs
  • Encrypts the data you send & receive online with VPN

 

- AVG AntiVirus Free

Our free antivirus software just got even better. It now includes real-time security updates, scans for both malware and performance issues, and even catches malicious downloads before they reach your PC. It’s also got an all-new, refreshingly simple design that shows you exactly how you’re protected. All of this, and it still won’t slow you down!

Whether you choose free or full protection, you've got impressive security that even updates itself automatically. And with a cutting-edge virus scanner that blocks and removes viruses, you can be reassured that you and your family are protected from the latest threats.

  • Stop viruses, spyware, ransomware & other malware
  • Block unsafe links, downloads, & email attachments
  • Scan for PC performance problems
  • Get real time-security updates

 

- BitDefender

Bitdefender Antivirus Free Edition is fast, free to use, and loaded only with the bare-bones protection features that every computer needs.

Bitdefender Antivirus Free Edition uses behavioral detection to closely monitor your active apps. When it detects anything suspicious, it takes instant action. Powerful scan engines ensure detection and removal of all malware, from viruses, worms and Trojans, to ransomware, zero-day exploits, rootkits and spyware. Bitdefender Antivirus Free Edition is an antivirus to rely on. It uses a minimalistic approach to make sure of the one thing that matters: whether you’re a rookie or a techie, your PC will be defended against intruders.

How can you keep your passwords safe and still browse freely? It’s easy: Bitdefender Antivirus Free Edition sniffs and blocks by default phishing websites that pretend to be trustworthy in order to steal your data.

If you ever land on scam websites, our advanced filtering system detects suspicious web page behavior and prevents your sensitive financial data from falling into the wrong hands.

 

- Avast Free Antivirus

Packed with the largest threat-detection network, machine-learning virus protection, easy password management and home network security that won’t slow down your PC.

Avast Free Antivirus scans for security and performance issues and tells you how to fix things instantly.

It protects you in real-time by analyzing unknown files before they get to you. So relax: With Avast, you’re running the most trusted antivirus out there.

 

- Keepass

The free, open source, light-weight and easy-to-use password manager.

Today you need to remember many passwords. You need a password for the Windows network logon, your e-mail account, your website's FTP password, online passwords (like website member account), etc. etc. etc. The list is endless. Also, you should use different passwords for each account. Because if you use only one password everywhere and someone gets this password you have a problem... A serious problem. The thief would have access to your e-mail account, website, etc. Unimaginable.

KeePass is a free open source password manager, which helps you to manage your passwords in a secure way. You can put all your passwords in one database, which is locked with one master key or a key file. So you only have to remember one single master password or select the key file to unlock the whole database. The databases are encrypted using the best and most secure encryption algorithms currently known (AES and Twofish). For more information, see the features page.

 

- ZoneAlarm free

Secure yourself with a robust antivirus solution and the world’s best firewall

  • Up-to-date antivirus detects and removes viruses, spyware, Trojan horses, worms, bots and rootkits.
  • Monitors programs for suspicious behavior, spotting and stopping new attacks that bypass traditional antivirus protection.
  • Makes your PC invisible to hackers, stopping spyware from exposing your data to the internet.
  • Alerts you of any unauthorized changes in your credit files.
  • Optimizes the performance of your online gaming programs, giving you the option to temporarily suspend security alerts, virus definition updates, and automatic scans.

 

- AdAware

Adaware antivirus safeguards your computer from online threats so you can focus on the things that matter to you — connecting with friends, checking email and watching videos.

  • AWARD-WINNING ANTIVIRUS PROTECTION - Stop viruses, ransomware, spyware and other forms of malware.            
  • DOWNLOAD PROTECTION - Scan all downloads before they have a chance to damage your PC.            
  • REAL-TIME PROTECTION - Block malicious processes and infected files in real-time.

 

- ClamWIN

ClamWin is a Free Antivirus program for Microsoft Windows 10 / 8 / 7 / Vista / XP / Me / 2000 / 98 and Windows Server 2012, 2008 and 2003. ClamWin Free Antivirus is used by more than 600,000 users worldwide on a daily basis. It comes with an easy installer and open source code. You may download and use it absolutely free of charge. It features: 

  • High detection rates for viruses and spyware;
  • Scanning Scheduler;
  • Automatic downloads of regularly updated Virus Database.
  • Standalone virus scanner and right-click menu integration to Microsoft Windows Explorer;
  • Addin to Microsoft Outlook to remove virus-infected attachments automatically.


Please note that ClamWin Free Antivirus does not include an on-access real-time scanner. You need to manually scan a file in order to detect a virus or spyware. 

ClamWin Free Antivirus is based on ClamAV engine and uses GNU General Public License by the Free Software Foundation, and is free (as in freedom) software. 

 

- Avira free security suite

  • Flexible: Activate only the apps you want
  • Future-proof: New, free apps are added automatically
  • All the essentials to ensure your security, privacy, and performance.

 

- Panda Free Antivirus

  • Antivirus Protection - Real-time protection against all types of malware and spyware. Schedule periodic scans and/or scan your computer on demand.
  • USB protection - Protect your PC by preventing the automatic execution of malware from USB drives. Scan all USB drives upon insertion.
  • Panda rescue kit - Free PC recovery system. Run an advanced scan of your PC or create a rescue USB drive to boot and clean those infected computers that won’t even start.
  • Multimedia/Game mode - This mode ensures you play or watch multimedia content without disturbance from your antivirus while remaining completely secure.