Buildbox - SoundBible is a great #indiedev resource to use to find free sound effects for your games. They have tons of themed sound clips from heavy rain to a hyena laughing!
1000+ Free Sound Effects, Music Tracks & Loops for Game Development - Super Dev Resources
AAA Game Character Goblin - Voice-over Sound Clips - Epic Stock Media
1000+ Free Sound Effects, Music Tracks & Loops for Game Development - Super Dev Resources
30 Video Game Sound Effects
Download Free Game Sound Effects | Mixkit
Short Songs - Royalty Free Audio Loops. Free Short Tunes, Background Music, Sound Clips for Games, Apps, Flash, Films, Multimedia - Album by Short Tracks and Interludes Collective | Spotify
Sounds of Gamification, Royalty Free Audio Loops for Games, Apps and Websites - Album by Buzzytunes Royalty Free Sound Clips | Spotify