by Kingstad (CC-BY):
rhino2.wav

by Apelsinsaft (CC-BY):
plasma_fire.wav
plasma_hit.wav

Astro Menace:
emg_hit.wav

Golgotha:
big_begrtha_gun_fire.wav
cannon_fire1.wav
cannon_fire2.wav
cannon_fire3.wav
cannon_fire4.wav
cannon_hit1.wav
cannon_hit4.wav
reaper_hit.wav
reaper_hit_boost.wav
tremor_fire.wav
supergun.wav
supergun_bass_boost.wav
heavy_cannon.wav

Open LieroX:
cannon_fire5.wav
cannon_hit2.wav
earthshaker.wav
earthshaker2.wav
generic_cannon2.wav
generic_cannon.wav
large_cannon_fire.wav
small_pop.WAV
arty_hit.wav

Scorched 3D:
cannon_fire6.wav
cannon_fire7.wav
heavy_cannon2.wav

Open Quarz:
outlaw_gun_openQuarz.wav
pillager_fire_openQuarz.wav
rhino.wav

TA Weapons Factory:
wolverine_fire.wav
wolverine_hit.wav

Nanoblobs:
cannon_fire8.wav

Merc Squad:
mini_cannon.wav

Partners in Rhyme
Machineg_single.wav

Unknown:
brawler_emg.wav

Kanoba:
cannon_hit3.wav
flak_fire.wav
flak_hit.wav
shell_gun.wav

Apelsinsaft (CC-BY):
cannon_fire9.wav

Sound Effects below created with sources provided by Soniss (https://sonniss.com/)
Source: [Game Audio GDC Bundle 2016, 2019, 2020] — freely distributed collection
License: Royalty-free for commercial and non-commercial use (per bundle license)
Notes: All sounds used under the terms provided in the original GDC Bundle download package

big_bertha_gun_fire2.wav - Airborne Sound - Battlefield Howitzers
cannon_hit5.wav - Airborne Sound - Battlefield Howitzers
lrpc_hit2.wav - Rock The Speakerbox - Broken
disruption_cannon1 - SoundMorph - Future Weapons 2