This release of SerialPlot brings two new features that I believe will be very useful.
Commands feature, allow you to define simple text (or binary) commands and send them to the connected device with a click.
With snapshots feature, you can capture the current state of the waveform without pausing and loosing data. Later you can open that snapshot in a separate window, rename and even save it to a CSV file. It's also possible to load a snapshot back from the CSV file.
As always you can download the binary installations for Debian Linux and Windows from downloads page.