CacheGuard
CacheGuard-OS is a free, open-source Linux-based network security appliance OS that turns any standard x86 machine into a UTM gateway. It sits between your devices and your ISP router, becoming the checkpoint for all internet traffic — no IT team required.
Open-source since its first release, CacheGuard-OS includes: stateful firewall, web antivirus (ClamAV), URL filtering, SSL inspection, WAF (ModSecurity), VPN server (StrongSwan), web cache (Squid), QoS (IPRoute2), and WAN load balancing.
It installs on bare metal or any common hypervisor in under an hour. Configuration is handled through a web-based admin interface with no command-line expertise needed.
Built for small businesses, schools, and sysadmins who need production-grade network security on commodity hardware.
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Avast Free Antivirus
Get award-winning free antivirus that comes with advanced privacy and security tools. Avast Free Antivirus can help protect you against advanced online threats, backed by one of the globe’s biggest Cyber Safety networks. And we’ve been proud winners of different awards over the years.
Avast Free Antivirus is more than just an antivirus — it also includes these specialist tools:
• 6 layers of security - Effortlessly run smart scans on software, files, and apps to help find vulnerabilities, plus analyze suspicious files in the cloud, get threat alerts, and more.
• Wi-Fi network security - Connect more safely to any Wi-Fi network, even unsecured public networks, plus see who’s using your home Wi-Fi and help block intruders with a click.
• Protection against ransomware attacks - Help protect your information. Don't let your personal photos, files, and documents fall victim to hackers using ransomware.
• Easy to install and use
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NethServer
Analyzes all web traffic and blocks selected websites via HTTP and even HTTPS using Squid proxy. Integrated with ClamAV antivirus and site blacklists. Multi-domain web server with ready LAMP stack. Virtual hosting allows to host multiple domain names on a single server. Based on NextCloud provides universal access to your files via the web, your computer or your mobile devices, wherever you are. Provide a private Slack-alternative with Mattermost. Open source messaging platform that enables secure team collaboration. Modern and powerful web interface based on Cockpit that simplifies common administration tasks, very easy and fast installation. Based on CentOS/RHEL, a widespread and popular server distribution, trusted by routine security updates, and rock solid stability.
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Hermes SEG
Hermes SEG is a free, open-source secure email gateway and server. It delivers spam, virus, and malware protection using SpamAssassin, ClamAV, and Amavisd-new, along with full encryption in transit and at rest via SMTP TLS, S/MIME, PGP, encrypted PDF (CipherMail), and Dovecot mail-crypt. It includes email archiving and integrated mailbox hosting with quotas, aliases, shared folders, Sieve rules, vacation replies, and mobile auto-configuration. Collaboration features come through Nextcloud (webmail, file sync, calendars, contacts). Identity and access are managed with OpenLDAP and Authelia, supporting SSO and MFA (TOTP, WebAuthn, Duo). It also enforces modern authentication standards: SPF, DKIM, DMARC, and ARC.
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