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Application firewalls

Show and control which apps on a computer or phone may connect to the network.

Side by side

Application firewalls
ToolStarsLicenceTermsSelf-hostedLanguageLatestLast push
OpenSnitch14kGPL-3.0Open sourceNoPythonv1.8.02026-07-26
Portmaster14kGPL-3.0Open sourceNoGov2.2.32026-10-06
LuLu13kGPL-3.0Open sourceNoObjective-Cv4.5.12026-10-04
simplewall9.1kGPL-3.0Open sourceNoCv.3.8.72026-10-01
Rethink DNS + Firewall5.5kApache-2.0Open sourceNoKotlinv0.5.72026-09-28
Blokada3.3kMPL-2.0Open sourceNoDartandroid.v5.23.2.12026-10-06
TrackerControl2.7kGPL-3.0Open sourceNoJava20260805012026-10-06

7 tools

OpenSnitch

OpenSnitch is a GNU/Linux interactive application firewall inspired by Little Snitch.

Language
Python
Licence
GPL-3.0
Stars
14k
Latest
v1.8.0
Last push
2026-07-26
simplewall

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

Language
C
Licence
GPL-3.0
Stars
9.1k
Latest
v.3.8.7
Last push
2026-10-01

What these tools replace