Best Open Source Firewall Software 2025

Firewall Software

Firewall Mac File Sharing BSD Clear Filters

Browse free open source Firewall software and projects for Mac and BSD below. Use the toggles on the left to filter open source Firewall software by OS, license, language, programming language, and project status.

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1

UPnP PortMapper

Manage port forwardings via UPnP

The UPnP PortMapper can be used to easily manage the port mappings/port forwarding of a UPnP enabled internet gateway/router in the local network.

9 Reviews

Downloads: 333 This Week

Last Update: 2024-09-14
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2

Ipfilter-X Tools by Nexus23 Labs

Two tools able to edit your ipfilter.dat . These tools are able to edit your ipfilter.dat in order to check for big ranges and to check adjacent ranges . From the creators of ipfilterX , Nexus23 Labs . - Updates in Progress -

3 Reviews

Downloads: 1 This Week

Last Update: 2025-09-18
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3

Voodoo Exchange Networking Library

Voodoo Exchange Networking Library is a D library that provides a simple API for creating streaming, peer-to-peer TCP connections between two clients, even if they are behind NATs or firewalls, by attempting multiple NAT traversal algorithms.

Downloads: 0 This Week

Last Update: 2016-07-25
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4

LanBiz

LanBiz is a free, Open Source Server Suite, mostly fitted for SOHO (Small Office/Home Office) environments. The final LanBiz will include: an internet gateway/firewall, proxy, mail, file/print, fax/telephony server and more!

1 Review

Downloads: 0 This Week

Last Update: 2014-05-11
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