NetWorker is a lightweight and easy-to-use tool that shows either the current download and upload speed or the session traffic of your network adapter. The information is shown in a small view in your menu bar.
You can switch between three modes: speed, traffic, or speed/traffic
You can choose the network adapter to observe, so both wired and wireless adapters are supported
Adjustable refresh interval
Support for auto-start
The vertical graph now correctly shows the upload value when configured