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Firewall & Network Security

Replaces: Cisco, proprietary

Open-source firewall and network security solutions for businesses and individuals. Powerful alternatives to Cisco and proprietary solutions.

🛡️ 8 Open Source Tools

pfSense CE

Powerful open-source firewall and router distribution

Apache-2.0 ●●● Advanced Self-hostable
Cisco ASA proprietary firewalls
Last: Feb 2026 5.0k
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OPNsense

Modern FreeBSD-based firewall with weekly updates

BSD-2-Clause ●●● Advanced Self-hostable
Cisco ASA proprietary firewalls
Last: Feb 2026 3.4k
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CrowdSec

Collaborative open-source security through crowd intelligence

MIT ●● Medium Self-hostable
Cisco ASA proprietary firewalls
Last: Feb 2026 9.2k
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Fail2ban

Automatic protection against brute-force attacks

GPL-2.0 ● Easy Self-hostable
Cisco ASA proprietary firewalls
Last: Feb 2026 12.0k
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UFW

Uncomplicated firewall for simple Linux server security

GPL-3.0 ● Easy Self-hostable
Cisco ASA proprietary firewalls
Last: Jan 2026 900
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Snort

World-leading open-source intrusion detection system

GPL-2.0 ●●● Advanced Self-hostable
Cisco ASA proprietary firewalls
Last: Feb 2026 6.2k
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Suricata

High-performance IDS/IPS with multi-threading architecture

GPL-2.0 ●●● Advanced Self-hostable
Cisco ASA proprietary firewalls
Last: Feb 2026 5.1k
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OpenSnitch

Application firewall for Linux desktops

GPL-3.0 ●● Medium Self-hostable
Cisco ASA proprietary firewalls
Last: Feb 2026 11.0k
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