Which of the following is a similar tool to IPerf with fewer features?

Netperf is indeed a performance measurement tool that, like IPerf, is used to test the bandwidth and latency of a network connection. While both tools serve similar purposes in evaluating network performance, Netperf has a narrower scope in comparison to IPerf, focusing mainly on network throughput and latency with essential tests that cover TCP and UDP protocols.

Netperf can provide useful data such as connection bandwidth and round-trip time, but it may not include as many features, options, or configurations as IPerf, which offers finer control over the testing environment, including the ability to specify various parameters for testing and reporting.

Each of the other options, while they may serve network performance evaluation in some capacity, do not directly compare as alternatives to IPerf with fewer features. For instance, Speedtest is primarily aimed at providing quick speed-testing services for end-users rather than detailed manipulation or testing specific protocols, and PingPlotter focuses more on visualizing ping and traceroute results rather than on raw bandwidth measurements. Although these tools are useful in networking, they don't fit the exact criteria of being a lighter version of IPerf in terms of feature set.