NetNak 

Display your internet data rate via modem, cable, DSL etc as text and on a graph. It keeps track of time online and total amount of data you send and receive. You can get a warning when exceed your preset limits and automatically hangup when you want
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DUNTrack 

Use DUNTrack to monitor, log & analyze your dial-up networking usage. Generate four different types of detailed reports about your usage pattern. With DUNTrack you also get a bunch of great tools which make the most out of your dial-up connection.
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