NetLimiter is a great application that displays bandwidth usage on a computer or server. It's really useful when you want to see how much bandwidth a specific process is using.

You can use NetLimiter to set download/upload transfer rate limits for applications or even single connection and monitor their internet traffic.

Along with this unique feature, Netlimiter offers comprehensive set of internet statistical tools. It includes real-time traffic measurement and long-term per-application internet traffic statistics

There are 3 versions, all can display the bandwidth usage of applications as well as history graphs but only the shareware/full versions can limit bandwidth of processes (the shareware versions costs, while the Freeware version is free).