bwmon
6.3#16 in bandwidth monitoring softwareFree planFree planWebAPILinuxSelf-hosted
Visitbwmon suits administrators investigating bandwidth use on a single Linux host who want local monitoring and history. The project says multi-host or long-horizon analytics call for heavier tools.
GlassWire suits people who want to monitor network activity on Windows or track app data use on Android. The free tier may fit users who need only short-term history; longer histories are listed with the paid plan.