opensnitch 1.5.8.1-1ubuntu0.1 (armhf binary) in ubuntu mantic

 Whenever a program makes a connection, it'll prompt the user to allow or deny
 it.
 .
 The user can decide if block the outgoing connection based on properties of
 the connection: by port, by uid, by dst ip, by program or a combination
 of them.
 .
 These rules can last forever, until the app restart or just one time.
 .
 The GUI allows the user to view live outgoing connections, as well as search
 by process, user, host or port.
 .
 OpenSnitch can also work as a system-wide domains blocker, by using lists
 of domains, list of IPs or list of regular expressions.