A super cool tool called SLUM, which stands for The Shadow Library Uptime Monitor. This dashboard can monitor the availability of popular "shadow libraries" in real-time, such as Anna's Archive, Sci-Hub, Z-Library, and Library Genesis. Through this platform, we can easily check the latest status of these resources, including certificate validity and operational status. The best part is that it is completely free, has no ads, and does not require registration; you can directly click to jump to the corresponding website.
Website address
https://open-slum.org