The official source is the Sliver GitHub repository maintained by Bishop Fox.
If you are looking for (often misspelled as "Silver"), this is a powerful, open-source command-and-control (C2) framework used by red teams and penetration testers for adversary simulation. Platform: Windows, Linux, and macOS. download silver 2
A collection of 16 professional plugins including the L1 Ultramaximizer and TrueVerb. You can download it through the Waves Central application after purchase. The official source is the Sliver GitHub repository