Today's Q and A session revealed a few things. Dave made copious notes before setting off early for the theatre. But for those who couldn't make it I made a few as well...
I mentioned it and then couldn't get to the examples on the internet. The club house is a victim of a 'slow internet' connection.
GNU Plot home page
Plotting sensor data using GnuPlot
interfacing early 90’s HQ digital oscilloscope from LINUX
FIR Filters by Windowing - using gnuplot
GIMP - Graphics Manipulation Package
4 Themes That Will Make GIMP 2.8 Look and Work Like Photoshop
LinPsk - PSK31 for Linux [download from Sourceforge]
A Slice of Raspberry Pi
WSPR on the Pi.
KICAD - KiCad EDA
A Cross Platform and Open Source Electronics Design Automation Suite.
Audacity - Audacity® is free, open source, cross-platform software for recording and editing sounds.
Audacity does work on my 'old' Pi. But would work much better on a later model. JB