BOINC
From NixOS Wiki
BOINC lets you contribute computing power on your home PC to projects doing research in many scientific areas. You can contribute to a single project, or to any combination of them. To install and enable BOINC on NixOS, add this to your configuration.nix:
services.boinc.enable = true;
Then to open the BOINC Manager, you can run the command boincmgr.