How would I act if the program link was removed from github, can I return to wallet seed using any other open source program?
Considering the fact that the algorithm used here is not documented anywhere and it only exists in the code on Github, you can only recover it using that code. Either you have to keep a backup of it locally for future use or you have to understand the algorithm yourself to be able to reproduce it if the code was not available or was not working for whatever reason.