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Top 7 C Firewall Projects
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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zfw
An EBPF based IPv4/IPv6 firewall with integrations for OpenZiti Zero-Trust Framework edge-routers and tunnellers
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I don't think that the author's proposed cat and mouse game is giving you any chance, because it requires a lot of maintenance and architectural changes.
I have the same problem, but I decided to maintain ASN lists of known spammers [1] and combine that with my eBPF based firewall that just drops their connections before it reaches the kernel [2].
So my websites, wikis and other things are protected by the same firewall architecture, for which I can deploy a unified "blockmap" so to speak. Probably gonna open source the dashboard for maintaining that over the holidays, too, as I'm trying to make everything combinable in the plug and play for Go backends sense similar to my markdown editor UI [3]
[1] https://github.com/cookiengineer/antispam
[2] https://github.com/tholian-network/firewall
[3] https://github.com/cookiengineer/golocron
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
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A note from our sponsor - SaaSHub
www.saashub.com | 12 Oct 2026
Index
What are some of the best open-source Firewall projects in C? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | esp_wifi_repeater | 5,267 |
| 2 | WinDivert | 3,289 |
| 3 | esp32_nat_router | 2,204 |
| 4 | gsocket | 1,929 |
| 5 | npf | 262 |
| 6 | zfw | 83 |
| 7 | firewall | 28 |
Sponsored
Monitoring that respects your time & budget
APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
www.appsignal.com