diff --git a/Formula/cartesi-machine-emulator@0.20.rb b/Formula/cartesi-machine-emulator@0.20.rb
new file mode 100644
index 0000000..3cbc720
--- /dev/null
+++ b/Formula/cartesi-machine-emulator@0.20.rb
@@ -0,0 +1,49 @@
+class CartesiMachineEmulatorAT020 < Formula
+  desc "Off-chain implementation of the Cartesi Machine"
+  homepage "https://github.com/cartesi/machine-emulator"
+  url "https://github.com/cartesi/machine-emulator/archive/refs/tags/v0.20.0.tar.gz"
+  sha256 "3746abb72d45dd2388f79fc24b048fe306db8e1f9f7e072176e51b95c4453949"
+  license "LGPL-3.0-only"
+
+  livecheck do
+    url :stable
+    regex(/^v?(0\.20(?:\.\d+)+)$/i)
+  end
+
+  # Versioned emulator kept for consumers that still target the 0.20 C API,
+  # namely cartesi-rollups-node. Keg-only so it never shadows the current
+  # cartesi-machine-emulator formula.
+  keg_only :versioned_formula
+
+  depends_on "boost" => :build
+  depends_on "llvm" => :build
+  depends_on "pkg-config" => :build
+  depends_on "libomp"
+  depends_on "libslirp"
+  depends_on "lua@5.4"
+
+  patch :p1 do
+    url "https://github.com/cartesi/machine-emulator/releases/download/v0.20.0/add-generated-files.diff"
+    sha256 "d9c2afcefc2759e7cd37bbedc83d54c81515f0fddb671103b489b8789aee33bb"
+  end
+
+  def install
+    ENV.llvm_clang # use brew llvm clang
+    cartesi_prefix = (etc/"cartesi/images")
+    cartesi_prefix.mkpath
+    (share/"cartesi-machine").mkpath
+    system "make", "BREW_PREFIX=#{prefix}"
+    system "make", "install", "PREFIX=#{prefix}", "IMAGES_RUNTIME_PATH=#{cartesi_prefix.realpath}"
+
+    # lua@5.4 is keg-only, so `lua5.4` is not on PATH at runtime. Rewrite the
+    # generated wrapper scripts to invoke it by absolute path.
+    inreplace [bin/"cartesi-machine", bin/"cartesi-machine-stored-hash"],
+              /^lua5\.4 /, "#{formula_opt_bin("lua@5.4")}/lua5.4 "
+  end
+
+  test do
+    assert_match(/cartesi-machine #{version}/, shell_output("#{bin}/cartesi-machine --version | head -1"))
+    assert_path_exists include/"cartesi-machine/machine-c-api.h"
+    assert_path_exists include/"cartesi-machine/jsonrpc-machine-c-api.h"
+  end
+end
diff --git a/Formula/cartesi-rollups-node.rb b/Formula/cartesi-rollups-node.rb
new file mode 100644
index 0000000..cd770c9
--- /dev/null
+++ b/Formula/cartesi-rollups-node.rb
@@ -0,0 +1,57 @@
+class CartesiRollupsNode < Formula
+  desc "Reference implementation of the Cartesi Rollups Node"
+  homepage "https://github.com/cartesi/rollups-node"
+  url "https://github.com/cartesi/rollups-node/archive/refs/tags/v2.0.0-alpha.12.tar.gz"
+  sha256 "8fcf4d775c7637b7698e642c70c31b7c16af28b77c118207a90d93da6187fc9a"
+  license "Apache-2.0"
+
+  livecheck do
+    url :stable
+    regex(/^v?(\d+(?:\.\d+)+(?:-alpha\.\d+)?)$/i)
+  end
+
+  depends_on "go" => :build
+  # 2.0.0-alpha.x builds against the 0.20 C API (machine-c-api.h), which the
+  # current cartesi-machine-emulator (0.21) renamed and changed.
+  depends_on "cartesi-machine-emulator@0.20"
+
+  def install
+    emulator = Formula["cartesi-machine-emulator@0.20"]
+
+    # The emulator is keg-only, so point cgo at its headers and libraries and
+    # bake an rpath so the node binaries find libcartesi at runtime.
+    ENV["CGO_CFLAGS"] = "-I#{emulator.opt_include}"
+    ENV["CGO_LDFLAGS"] = "-L#{emulator.opt_lib}"
+    ldflags = %W[
+      -s -w
+      -X github.com/cartesi/rollups-node/internal/version.BuildVersion=#{version}
+      -r #{emulator.opt_lib}
+    ]
+
+    # These link against libcartesi and spawn `cartesi-jsonrpc-machine`, which
+    # lives in the keg-only emulator and is therefore not on PATH. Build them
+    # into bin, then let env_script_all_files move everything currently in bin
+    # to libexec/bin and leave wrappers in bin that prepend the emulator's bin.
+    machine_binaries = %w[node advancer validator]
+    machine_binaries.each do |name|
+      system "go", "build", *std_go_args(ldflags:, output: bin/"cartesi-rollups-#{name}"),
+             "./cmd/cartesi-rollups-#{name}"
+    end
+    bin.env_script_all_files(libexec/"bin", PATH: "#{emulator.opt_bin}:$PATH")
+
+    # The remaining services and tools are pure Go.
+    other_binaries = %w[cli evm-reader claimer jsonrpc-api prt machine-tool]
+    other_binaries.each do |name|
+      system "go", "build", *std_go_args(ldflags:, output: bin/"cartesi-rollups-#{name}"),
+             "./cmd/cartesi-rollups-#{name}"
+    end
+  end
+
+  test do
+    assert_match "cartesi-rollups-cli version #{version}", shell_output("#{bin}/cartesi-rollups-cli --version")
+    # Exercises the wrapper and dynamic linking against the keg-only emulator.
+    assert_match "cartesi-rollups-node version #{version}", shell_output("#{bin}/cartesi-rollups-node --version")
+    assert_match "cartesi-rollups-advancer version #{version}",
+                 shell_output("#{bin}/cartesi-rollups-advancer --version")
+  end
+end
diff --git a/README.md b/README.md
index 1c5818a..0268bdb 100644
--- a/README.md
+++ b/README.md
@@ -54,8 +54,10 @@ Homebrew 5.x and earlier there is no `brew trust` command and no trust step is n
 | [`cartesi`](Formula/cartesi.rb) | CLI for developing Cartesi applications ([cartesi/cli](https://github.com/cartesi/cli)) |
 | [`cartesi-machine`](Formula/cartesi-machine.rb) | Metapackage that pulls in the emulator plus the Linux and rootfs images |
 | [`cartesi-machine-emulator`](Formula/cartesi-machine-emulator.rb) | Off-chain implementation of the Cartesi Machine ([cartesi/machine-emulator](https://github.com/cartesi/machine-emulator)) |
+| [`cartesi-machine-emulator@0.20`](Formula/cartesi-machine-emulator@0.20.rb) | Keg-only emulator 0.20, kept for `cartesi-rollups-node` which still targets its C API |
 | [`cartesi-machine-linux-image`](Formula/cartesi-machine-linux-image.rb) | Kernel image for the Cartesi Machine ([cartesi/machine-linux-image](https://github.com/cartesi/machine-linux-image)) |
 | [`cartesi-machine-rootfs-image`](Formula/cartesi-machine-rootfs-image.rb) | Rootfs image for the Cartesi Machine ([cartesi/machine-guest-tools](https://github.com/cartesi/machine-guest-tools)) |
+| [`cartesi-rollups-node`](Formula/cartesi-rollups-node.rb) | Reference implementation of the Cartesi Rollups Node ([cartesi/rollups-node](https://github.com/cartesi/rollups-node)) |
 | [`xgenext2fs`](Formula/xgenext2fs.rb) | Ext2 filesystem generator for embedded systems ([cartesi/genext2fs](https://github.com/cartesi/genext2fs)) |
 
 `cartesi-machine` is the recommended entry point: it is a metapackage with no files of its own that
@@ -79,6 +81,21 @@ brew install cartesi
 cartesi --version
 ```
 
+Install the Rollups Node and its services:
+
+```shell
+brew install cartesi-rollups-node
+cartesi-rollups-node --version
+cartesi-rollups-cli --help
+```
+
+`cartesi-rollups-node` pulls in `cartesi-machine-emulator@0.20`, a keg-only build of the emulator
+that the 2.0.0-alpha node series still compiles against. It does not conflict with the current
+`cartesi-machine-emulator` and is not linked into `bin`; the node binaries find it on their own.
+Running the node still needs a PostgreSQL database and an Ethereum JSON-RPC endpoint, configured
+through `CARTESI_*` environment variables as described in the
+[node documentation](https://github.com/cartesi/rollups-node).
+
 The image formulae install their payloads into `$(brew --prefix)/etc/cartesi/images`, symlinked as
 `linux.bin` and `rootfs.ext2`. The emulator is configured at build time to look there, so it picks
 up the images automatically once both formulae are installed.