There are 2 repositories under codecave topic.
Search for code cave in all binaries
CaveCarver - PE backdooring tool which utilizes and automates code cave technique
Tool to find code cave in PE image (x86 / x64) - Find empty space to place code in PE files
Codecave miner:mag:
Code Cave Finder And Injector For Exe(PE) .
A wallhack for Urban Terror 4.3.4 that reveals entities through walls by hooking the game's OpenGL function glDrawElements and disabling depth testing for OpenGL.