NetHogs
5.9#25 in bandwidth monitoring softwareFree planFree planLinuxmacOS
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NetHogs suits users who want to find which process is behind network traffic, especially on Linux. Mac OS X and FreeBSD users can see connections but not the processes behind them.
ntopng suits people who need traffic visibility across network sources and want real-time or historical exploration. The free Community edition is described for home and network practitioners with smaller networks.