Sukebei Nyaa (nyaa.si) is a replacement of the popular adult section of Nyaa.se. This Sukebei alternative came quickly up when the anime torrent site Nyaa (Nyaa.se / Nyaa.eu) shut down in May 2017.
Sukebei.nyaa.is is part of the NyaaV2 project. It’s a Nyaa.se replacement written in Python. The project’s codebase is published on GitHub.