Breakdown

Most weapon sounds taken from Entropy Zero 2, which brings along improved sounds of half life 2 weapons. Others are from half life 2, namely enemy sounds or some weapons
2 sounds for the shotgun (all sounds from here have equal chances to play)
2 sounds for the handgun
1 sound for the extraction point final alarm (red light countdown)
1 sound for the extraction locator ping
3 sounds for explosions
1 sound for the shockwave grenade
Stalker scream jumpscare sound for upscream
19 sounds for trudge (hl2 strider)
1 sound for the peeper, radio, and music box
8 sounds for animal (fast zombie hl2)
3 sounds for spotting a dead player or encountering an enemy
3 grabber sounds (gravity gun)

Changelog

1.0.0: Release
2.0.0: Added variations for some sounds
2.0.1: Fixed said variations, added shockwave grenade sound, changed icon
3.0.0: Added some enemy sounds, added sounds for the sword (crowbar sounds)
3.0.1: Removed sword sounds (really weird and broken)
4.0.0: Replaced nearly every sound from trudge with that of the hl2 strider
4.0.1: Fixed README
4.5.0: Headmanhack update
5.0.0: Added sounds for rugrat, most if not all replaced
5.5.0: Added sounds for animal, and some other miscellaneous changes: peeper spot sound, radio music, music box music, headman death sound
5.5.1: Head + enemy encounter sounds
6.0.0: Fixed an explosion sound, removed rugrat's sounds, headman, and spewer because they felt unnatural and boring
6.0.1: actually added the fixed sound
6.0.2: Fixed trudge's sounds not working
6.0.3: Removed deprecated dependency, added sounds for the grabber