- **pfSense**
- Latest version: 2.8.1
- Release date: September 3, 2025
- Key features: Traffic shaping, IDS, firewall, load balancing, web management, high stability
- **OPNsense**
- Latest version: 25.7.2
- Release date: August 20, 2025
- Key features: Transparent proxy, IDS/IPS (Suricata), SSL VPN, weekly security patches, REST API, cloud/VM support
- **IPFire**
- Latest version: 2.29 Core Update 197
- Release date: September 18, 2025
- Key features: Deep packet inspection, traffic reporting, DoS protection, VLAN support, technical team friendly
- **ClearOS**
- Latest community version: 7.9.1 (no newer versions on main site, active as of 2024)
- Latest activity: October 16, 2024
- Key features: Simple UI, SMB/home focus, VPN, proxy, mail, IDS, etc.
- **Endian Firewall**
- Latest version: 6.8.0
- Release date: April 23, 2025
- Key features: IDS/IPS, VPN, multi-uplink, content filtering, hardware and virtualized deployment support
- **IPCop**
- Latest version: 2.1.9 (project is largely inactive, last update around 2015)
- Release date: ~2015
- Key features: Basic firewall, VPN, traffic shaping, more instructional/testing use
- **Untangle (Arista NG Firewall)**
- Latest version: 17.3.0
- Release date: May 2025
- Key features: IDS/IPS, unified threat management, web filtering, threat prevention, virtual/cloud deployments supported
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