diff --git a/Formula/cassandra@2.1.rb b/Formula/cassandra@2.1.rb
new file mode 100644
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+++ b/Formula/cassandra@2.1.rb
@@ -0,0 +1,115 @@
+class CassandraAT21 < Formula
+  desc "Distributed key-value store"
+  homepage "https://cassandra.apache.org"
+  url "https://archive.apache.org/dist/cassandra/2.1.13/apache-cassandra-2.1.13-bin.tar.gz"
+  sha256 "102fffe21b1641696cbdaef0fb5a2fecf01f28da60c81a1dede06c2d8bdb6325"
+
+  keg_only :versioned_formula
+
+  depends_on :python if MacOS.version <= :snow_leopard
+
+  # Only Yosemite has new enough setuptools for successful compile of the below deps.
+  resource "setuptools" do
+    url "https://pypi.python.org/packages/source/s/setuptools/setuptools-12.0.5.tar.gz"
+    sha256 "bda326cad34921060a45004b0dd81f828d471695346e303f4ca53b8ba6f4547f"
+  end
+
+  resource "thrift" do
+    url "https://pypi.python.org/packages/source/t/thrift/thrift-0.9.2.tar.gz"
+    sha256 "08f665e4b033c9d2d0b6174d869273104362c80e77ee4c01054a74141e378afa"
+  end
+
+  resource "futures" do
+    url "https://pypi.python.org/packages/source/f/futures/futures-2.2.0.tar.gz"
+    sha256 "151c057173474a3a40f897165951c0e33ad04f37de65b6de547ddef107fd0ed3"
+  end
+
+  resource "six" do
+    url "https://pypi.python.org/packages/source/s/six/six-1.9.0.tar.gz"
+    sha256 "e24052411fc4fbd1f672635537c3fc2330d9481b18c0317695b46259512c91d5"
+  end
+
+  resource "cql" do
+    url "https://pypi.python.org/packages/source/c/cql/cql-1.4.0.tar.gz"
+    sha256 "7857c16d8aab7b736ab677d1016ef8513dedb64097214ad3a50a6c550cb7d6e0"
+  end
+
+  resource "cassandra-driver" do
+    url "https://pypi.python.org/packages/source/c/cassandra-driver/cassandra-driver-2.6.0.tar.gz"
+    sha256 "753505a02b4c6f9b5ef18dec36a13f17fb458c98925eea62c94a8839d5949717"
+  end
+
+  def install
+    (var+"lib/cassandra").mkpath
+    (var+"log/cassandra").mkpath
+
+    pypath = libexec/"vendor/lib/python2.7/site-packages"
+    ENV.prepend_create_path "PYTHONPATH", pypath
+    %w[setuptools thrift futures six cql cassandra-driver].each do |r|
+      resource(r).stage do
+        system "python", *Language::Python.setup_install_args(libexec/"vendor")
+      end
+    end
+
+    inreplace "conf/cassandra.yaml", "/var/lib/cassandra", "#{var}/lib/cassandra"
+    inreplace "conf/cassandra-env.sh", "/lib/", "/"
+
+    inreplace "bin/cassandra", "-Dcassandra.logdir\=$CASSANDRA_HOME/logs", "-Dcassandra.logdir\=#{var}/log/cassandra"
+    inreplace "bin/cassandra.in.sh" do |s|
+      s.gsub! "CASSANDRA_HOME=\"`dirname \"$0\"`/..\"", "CASSANDRA_HOME=\"#{libexec}\""
+      # Store configs in etc, outside of keg
+      s.gsub! "CASSANDRA_CONF=\"$CASSANDRA_HOME/conf\"", "CASSANDRA_CONF=\"#{etc}/cassandra\""
+      # Jars installed to prefix, no longer in a lib folder
+      s.gsub! "\"$CASSANDRA_HOME\"/lib/*.jar", "\"$CASSANDRA_HOME\"/*.jar"
+      # The jammm Java agent is not in a lib/ subdir either:
+      s.gsub! "JAVA_AGENT=\"$JAVA_AGENT -javaagent:$CASSANDRA_HOME/lib/jamm-", "JAVA_AGENT=\"$JAVA_AGENT -javaagent:$CASSANDRA_HOME/jamm-"
+      # Storage path
+      s.gsub! "cassandra_storagedir\=\"$CASSANDRA_HOME/data\"", "cassandra_storagedir\=\"#{var}/lib/cassandra\""
+    end
+
+    rm Dir["bin/*.bat", "bin/*.ps1"]
+
+    # This breaks on `brew uninstall cassandra && brew install cassandra`
+    # https://github.com/Homebrew/homebrew/pull/38309
+    (etc+"cassandra").install Dir["conf/*"]
+
+    libexec.install Dir["*.txt", "{bin,interface,javadoc,pylib,lib/licenses}"]
+    libexec.install Dir["lib/*.jar"]
+
+    share.install [libexec+"bin/cassandra.in.sh", libexec+"bin/stop-server"]
+    inreplace Dir["#{libexec}/bin/cassandra*", "#{libexec}/bin/debug-cql", "#{libexec}/bin/nodetool", "#{libexec}/bin/sstable*"],
+              %r{`dirname "?\$0"?`/cassandra.in.sh},
+              "#{share}/cassandra.in.sh"
+
+    bin.write_exec_script Dir["#{libexec}/bin/*"]
+    rm bin/"cqlsh" # Remove existing exec script
+    (bin/"cqlsh").write_env_script libexec/"bin/cqlsh", :PYTHONPATH => pypath
+  end
+
+  def plist; <<-EOS.undent
+    <?xml version="1.0" encoding="UTF-8"?>
+    <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+    <plist version="1.0">
+      <dict>
+        <key>KeepAlive</key>
+        <true/>
+        <key>Label</key>
+        <string>#{plist_name}</string>
+        <key>ProgramArguments</key>
+        <array>
+            <string>#{opt_bin}/cassandra</string>
+            <string>-f</string>
+        </array>
+        <key>RunAtLoad</key>
+        <true/>
+        <key>WorkingDirectory</key>
+        <string>#{var}/lib/cassandra</string>
+      </dict>
+    </plist>
+    EOS
+  end
+
+  test do
+    system "#{bin}/cassandra", "-v"
+  end
+end