The alternative to Ryujinx... Is Ryujinx itself. And soon something else. It has been forked, archived and mirrored. Someone will pick up the project, even if just out of spite against Nintendo.
I have gotten so sick of Nintendo's shit that I have started cloning all of the emulator repos that I use. Thankfully I had pulled latest less than an hour before the repo was pulled. Others have beaten me to the punch for forking and re-hosting, but you can include me in the archive army.