KittyStager is a simple stage 0 C2. It is made of a web server to host the shellcode and an implant, called kitten. The purpose of this project is to be able to have a web server and some kitten and be able to use the with any shellcode.
Why do you think that https://github.com/jm33-m0/emp3r0r is a good alternative to KittyStager