Does it work with electrum seed or can I customize new words other than BIP39 words.
I recommend not to use BIP39-XOR with Electrum "seed" because of its differences from BIP39 (specification). Auto-generated "seeds" will not be compliant with Electrum ones. However, XOR results of manually (user) input "seed" should be the same in both cases.
How would I act if the program link was removed from github, can I return to wallet seed using any other open source program?
Yes, you could use another open source program, e.g. "
https://bitcoiner.guide/seed/".
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.
False.
Thank you for feedback, again.
Can I ask you to consider giving a star in GitHub if you find
https://github.com/GregTonoski/BIP39-XOR interesting, please? More than 50 starts are required by package repositories, e.g. brew.sh to accept software for distribution.