Portmaster and SPN by Safing.io

[Zesko]

@Zesko

Portmaster is a good alternative to Glasswire (for Windows only) and OpenSnitch

• It monitors all apps to use network activity with clear details: where, when, which app, which protocol.
• Ability to block unwanted connections of app.
• Auto-block via selected custom filter lists.
• It would notify you if it is possible.
• And more.

https://forum.manjaro.org/t/favorite-lesser-known-apps/5481/290

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Edit:

This app would help @alven to solve the old issue:

Add an installation step of firewall setup or to notify a user that no firewall enabled by default

Hi, Manjaro team! According to Linux Security - Manjaro: Running a local firewall is almost always a good practice. and to Does Manjaro has disabled firewall by default? Please introduce an installation step of firewall setup. If a user prefer to not enable firewall, than the user will be notified about that firewall disabled in his installation copy of OS. Simplest basic single rule can prevent a huge problems: to block all incoming connections on all protocols (at least tcp, udp). Thi…