Some random programs that are not in nixpkgs (or in the process of being added).
Flakes:
# flake.nix
inputs = {
# ... your other inputs
chiheisen.url = "git+https://git.sr.ht/~chiheisen/my-nix";
chiheisen.inputs.nixpkgs.follows = "nixpkgs";
}
Adding packages:
# in environment.systemPackages, home.packages or similar
inputs.chiheisen.packages."${system}".<pkg>;