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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.

🛡️ 23 Open Source Tools
P

pfSense CE

Powerful open-source firewall and router distribution

5.0k
Cisco ASAproprietary firewalls
Apache-2.0●●● Advanced
Mar 2026
O

OPNsense

Modern FreeBSD-based firewall with weekly updates

3.4k
Cisco ASAproprietary firewalls
BSD-2-Clause●●● Advanced
Aug 2026
C

CrowdSec

Collaborative open-source security through crowd intelligence

9.2k
Cisco ASAproprietary firewalls
MIT●● Medium
Aug 2026
F

Fail2ban

Automatic protection against brute-force attacks

12.0k
Cisco ASAproprietary firewalls
GPL-2.0● Easy
Aug 2026
U

UFW

Uncomplicated firewall for simple Linux server security

900
Cisco ASAproprietary firewalls
GPL-3.0● Easy
Dec 2012
S

Snort

World-leading open-source intrusion detection system

6.2k
Cisco ASAproprietary firewalls
GPL-2.0●●● Advanced
Apr 2026
S

Suricata

High-performance IDS/IPS with multi-threading architecture

5.1k
Cisco ASAproprietary firewalls
GPL-2.0●●● Advanced
Aug 2026
O

OpenSnitch

Application firewall for Linux desktops

11.0k
Cisco ASAproprietary firewalls
GPL-3.0●● Medium
Jul 2026

Super

SPR: Open Source, secure, user friendly and fast wifi routers for your home.

502
Ciscoproprietary
BSD-3-Clause●● Medium
Aug 2026

Safeline

SafeLine is a self-hosted WAF(Web Application Firewall) / reverse proxy to protect your web apps from…

21.2k
Ciscoproprietary
GPL-3.0●● Medium
Jul 2026

Pentagi

Fully autonomous AI Agents system capable of performing complex penetration testing tasks

16.6k
Ciscoproprietary
MIT●●● Advanced
Aug 2026

Portmaster

Love Freedom - ❌ Block Mass Surveillance

12.6k
Ciscoproprietary
GPL-3.0●● Medium
Aug 2026

Simplewall

Simple tool to configure Windows Filtering Platform (WFP) which can configure network activity on your…

8.4k
Ciscoproprietary
GPL-3.0● Easy
Aug 2026

Whoami Project

Whoami provides enhanced privacy, anonymity for Debian and Arch based linux distributions

2.3k
Ciscoproprietary
GPL-3.0●● Medium
Oct 2025

Privacy Settings

Guide to privacy settings for most major software and services.

1.9k
Ciscoproprietary
MIT●● Medium
Aug 2026

Core

A privacy-preserving home security camera that uses advanced end-to-end encryption.

1.1k
Ciscoproprietary
GPL-3.0●●● Advanced
Aug 2026

Wholeaked

a file-sharing tool that allows you to find the responsible person in case of a leakage

1.1k
Ciscoproprietary
BSD-3-Clause●● Medium
Jan 2022

Clearcam

Add object detection, tracking, mobile notifications, and search to any security camera.

680
Ciscoproprietary
GPL-3.0●● Medium
Aug 2026

Strix

Smart IP camera stream finder. Tests 102K+ URL patterns in 30 seconds. Supports 67K camera models.…

673
Ciscoproprietary
MIT●● Medium
Apr 2026

Athena

Athena is a Material You (Material 3) firewall and ad blocker that works seamlessly on both rooted and…

621
Ciscoproprietary
GPL-3.0●● Medium
Jan 2026

Windows On Reins

Wor is a Powershell script to harden, debloat, optimize, enhance privacy, avoid fingerprinting and improve…

472
Ciscoproprietary
GPL-3.0●● Medium
Jun 2025

Macos Fortress

Firewall and Privatizing Proxy for Trackers, Attackers, Malware, Adware, and Spammers with Anti-Virus…

449
Ciscoproprietary
MIT● Easy
Nov 2021

Local Sheriff

Think of Local sheriff as a recon tool in your browser (WebExtension).

309
Ciscoproprietary
GPL-3.0●● Medium
Dec 2022