The following software works great (on Arch Linux):

• General logging: qlog which can be found from both AUR and Flatpak
• Digital modes: WSJT-X_improved from AUR
• Contesting: not1mm. I recommend using cwdaemon for generating CW rather than CAT with rigctld. The latter is buggy and can crash frequently. Install using the uv system (python).

145′ Rotating Rohn 55 tower (tower hardware & installation KC1XX) 

Antennas:

• 160m/80m inverted L with 80 radials
• 60m dipole
• 40m 3 element yagi (JK Antennas) at 145′
• 30m 2 element yagi (JK Antennas) at 105′
• 20m 3/3 yagi stack (JK Antennas) at 132′ and 90′
• 17m 3 element yagi (JK Antennas) at 105′
• 15m 4/4 yagi stack (JK Antennas) at 132′ and 90′
• 12m 4 element yagi (JK Antennas) at 105′
• 10m 5/5 yagi stack (JK Antennas) at 132′ and 90′
• 6m 6 element LFA yagi (InnovAntennas) at 52′
• Antenna switching: Hamation Bandmaster V controller
  and DX Engineering RR8B-HP remote switch
• Stack match: Hamation PB-2 controller and Hamation
  SM-2 switching unit
• Rotor: K0XG rotor and bearings from KC1XX
  and Green Heron RT-21 controller
• UNUNs & BALUNS from Balun Designs
• LMR-600 UltraFlex and 7/8″ Heliax coaxial cables from Davis RF

Elecraft K4 with KPA-1500 & Acom 2000A amplifiers.

If one starts cwdaemon directly on Linux, it produces rather choppy and poor CW. So, I experimented a bit and it seems that the following will produce nice and consistent CW:

# echo 1 > /sys/bus/usb-serial/devices/ttyUSB1/latency_timer
# chrt -f 99 /usr/bin/cwdaemon -d /dev/ttyUSB1 -o key=DTR -o ptt=none -x n

This reduces the rs232 port latency (1st line; 1 ms latency), runs cwdaemon with real time priority (chrt command) and disables audio output on the computer (-x n). In my case above /dev/ttyUSB1 is the RS232 port for the radio, which uses DTR signal for keying.

Once can put the above in a bash script so cwdaemon can be started easily.