diff --git a/COPYING.csv b/COPYING.csv
new file mode 100644
index 00000000000..c880ccb73ae
--- /dev/null
+++ b/COPYING.csv
@@ -0,0 +1,36 @@
+jruby,9.1.14.0,https://jruby.org/,EPL-1.0|GPL-2.0|LGPL-2.1
+bytelist,,http://github.com/jruby/bytelist,EPL-1.0|GPL-2.0|LGPL-2.1
+jnr-posix,,https://github.com/jnr/jnr-posix,EPL-1.0|GPL-2.0|LGPL-2.1
+jruby-openssl,,https://github.com/jruby/jruby-openssl,EPL-1.0|GPL-2.0|LGPL-2.1
+jruby-readline,,https://github.com/jruby/jruby-readline,EPL-1.0|GPL-2.0|LGPL-2.1
+psych,,https://github.com/ruby/psych),MIT
+jay-yydebug,,http://svn.codehaus.org/jruby/trunk/jay/yydebug,EPL-1.0|GPL-2.0|LGPL-2.0
+control.js,,,MIT
+dragdrop.js,,,MIT
+effect.js,,,MIT
+prototype.js,,,MIT
+asm,,http://asm.objectweb.org,BSD
+jline2,,https://github.com/jline/jline2,BSD
+jzlib,,https://www.jcraft.com/jzlib/,BSD-3-Clause
+rake,,https://github.com/ruby/rake,MIT
+jcodings,,http://github.com/jruby/jcodings,MIT
+joni,,http://github.com/jruby/joni,MIT
+bouncycastle,,http://www.bouncycastle.org,MIT
+jnr-x86asm,,https://github.com/jnr/jnr-x86asm,MIT
+invokebinder,,https://github.com/headius/invokebinder,Apache-2.0
+jffi,,https://github.com/jnr/jffi,Apache-2.0
+jitescript,,https://github.com/qmx/jitescript,Apache-2.0
+jnr-constants,,http://github.com/jnr/jnr-constants,Apache-2.0
+jnr-enxio,,https://github.com/jnr/jnr-enxio,Apache-2.0
+jnr-ffi,,https://github.com/jnr/jnr-jffi,Apache-2.0
+jnr-netdb,,http://github.com/jnr/jnr-netdb,Apache-2.0
+jnr-unixsocket,,https://github.com/jnr/jnr-unixsocket,Apache-2.0
+joda-time,,http://joda-time.sourceforge.net,Apache-2.0
+maven,,http://maven.apache.org/,Apache-2.0
+nailgun,,http://martiansoftware.com/nailgun,Apache-2.0
+options,,https://github.com/headius/options,Apache-2.0
+snakeyaml,,https://github.com/asomov/snakeyaml,Apache-2.0
+unsafe-fences,,https://github.com/headius/unsafe-fences,Apache-2.0
+racc,,https://github.com/tenderlove/racc,Ruby
+json-generator,,https://github.com/flori/json,Ruby
+json-parser,,https://github.com/flori/json,Ruby
diff --git a/bin/dependencies-report b/bin/dependencies-report
new file mode 100755
index 00000000000..63979513c93
--- /dev/null
+++ b/bin/dependencies-report
@@ -0,0 +1,32 @@
+#!/bin/sh
+# Generate a dependency report.
+
+unset CDPATH
+# This unwieldy bit of scripting is to try to catch instances where Logstash
+# was launched from a symlink, rather than a full path to the Logstash binary
+if [ -L "$0" ]; then
+  # Launched from a symlink
+  # --Test for the readlink binary
+  RL="$(which readlink)"
+  if [ $? -eq 0 ]; then
+    # readlink exists
+    SOURCEPATH="$(${RL} $0)"
+  else
+    # readlink not found, attempt to parse the output of stat
+    SOURCEPATH="$(stat -c %N $0 | awk '{print $3}' | sed -e 's/\‘//' -e 's/\’//')"
+    if [ $? -ne 0 ]; then
+      # Failed to execute or parse stat
+      echo "Failed to find source library at path $(cd `dirname $0`/..; pwd)/bin/logstash.lib.sh"
+      echo "You may need to launch Logstash with a full path instead of a symlink."
+      exit 1
+    fi
+  fi
+else
+  # Not a symlink
+  SOURCEPATH="$0"
+fi
+
+. "$(cd `dirname ${SOURCEPATH}`/..; pwd)/bin/logstash.lib.sh"
+setup
+
+ruby_exec "logstash-core/lib/logstash/dependency_report_runner.rb" "$@"
diff --git a/logstash-core/lib/logstash/dependency_report.rb b/logstash-core/lib/logstash/dependency_report.rb
new file mode 100644
index 00000000000..ba4899a7250
--- /dev/null
+++ b/logstash-core/lib/logstash/dependency_report.rb
@@ -0,0 +1,131 @@
+# encoding: utf-8
+Thread.abort_on_exception = true
+Encoding.default_external = Encoding::UTF_8
+$DEBUGLIST = (ENV["DEBUG"] || "").split(",")
+
+require "clamp"
+require "logstash/namespace"
+require "rubygems"
+require "jars/gemspec_artifacts"
+
+class LogStash::DependencyReport < Clamp::Command
+  option [ "--csv" ], "OUTPUT_PATH", "The path to write the dependency report in csv format.",
+    :required => true, :attribute_name => :output_path
+
+  def execute
+    require "csv"
+    CSV.open(output_path, "wb", :headers => [ "name", "version", "url", "license" ], :write_headers => true) do |csv|
+      puts "Finding gem dependencies"
+      gems.each { |d| csv << d }
+      puts "Finding java/jar dependencies"
+      jars.each { |d| csv << d }
+    end
+
+    # Copy in COPYING.csv which is a best-effort, hand-maintained file of dependency license information.
+    File.open(output_path, "a+") do |file|
+      extra = File.join(File.dirname(__FILE__), "..", "..", "..", "COPYING.csv")
+      file.write(IO.read(extra))
+    end
+    nil
+  end
+
+  def gems
+    # @mgreau requested `logstash-*` dependencies be removed from this list: 
+    # https://github.com/elastic/logstash/pull/8837#issuecomment-351859433
+    Gem::Specification.reject { |g| g.name =~ /^logstash-/ }.collect do |gem|
+      licenses = ("UNKNOWN" if gem.licenses.empty?) || (gem.licenses.map { |l| SPDX.map(l) }.join("|") if !gem.licenses.empty?)
+      [gem.name, gem.version.to_s, gem.homepage, licenses]
+    end
+  end
+
+  def jars
+    jars = []
+    # For any gems with jar dependencies,
+    #   Look at META-INF/MANIFEST.MF for any jars in each gem
+    #   Note any important details.
+    Gem::Specification.select { |g| g.requirements && g.requirements.any? { |r| r =~ /^jar / } }.collect do |gem|
+
+      # Where is the gem installed
+      root = gem.full_gem_path
+
+      Dir.glob(File.join(root, "**", "*.jar")).collect do |path|
+        jar = java.util.jar.JarFile.new(path)
+        manifest = jar.getManifest
+
+        pom_entries = jar.entries.select { |t| t.getName.start_with?("META-INF/maven/") && t.getName.end_with?("/pom.properties") }
+
+        # Some jar files have multiple maven pom.properties files. It is unclear how to know what is correct?
+        # TODO(sissel): Maybe we should use all pom.properties files? None of the pom.properties/pom.xml files have license information, though.
+        # TODO(sissel): In some cases, there are META-INF/COPYING and
+        #   META-INF/NOTICE.txt files? Can we use these somehow? There is no
+        #   common syntax for parsing these files, though...
+        pom_map = if pom_entries.count == 1
+          pom_in = jar.getInputStream(pom_entries.first)
+          pom_content = pom_in.available.times.collect { pom_in.read }.pack("C*")
+          # Split non-comment lines by `key=val` into a map { key => val }
+          Hash[pom_content.split(/\r?\n/).grep(/^[^#]/).map { |line| line.split("=", 2) }]
+        else
+          {}
+        end
+
+        next if manifest.nil?
+        # convert manifest attributes to a map w/ keys .to_s
+        # without this, the attribute keys will be `Object#inspect` values
+        # like #<Java::JavaUtilJar::Attributes::Name0xabcdef0>
+        attributes = Hash[manifest.getMainAttributes.map { |k,v| [k.to_s, v] }]
+
+        begin
+          # Prefer the maven/pom groupId when it is available.
+          artifact = pom_map.fetch("artifactId", attributes.fetch("Implementation-Title"))
+          group = pom_map.fetch("groupId", attributes.fetch("Implementation-Vendor-Id"))
+          jars << [
+            group + ":" + artifact,
+            attributes.fetch("Bundle-Version"),
+            attributes.fetch("Bundle-DocURL"),
+            SPDX.map(attributes.fetch("Bundle-License")),
+          ]
+        rescue KeyError => e
+          # The jar is missing a required manifest field, it may not have any useful manifest data.
+          # Ignore it and move on.
+        end
+      end
+    end
+    jars.uniq.sort
+  end
+
+  module SPDX
+    # This is a non-exhaustive, best effort list of licenses as they map to SPDX identifiers.
+    ALIASES = {
+      "Apache-2.0" => [
+        "Apache 2",
+        "apache-2.0",
+        "Apache 2.0",
+        "Apache License (2.0)",
+        "Apache License 2.0",
+        "https://www.apache.org/licenses/LICENSE-2.0.txt",
+        "http://www.apache.org/licenses/LICENSE-2.0.txt",
+      ],
+      "Artistic-2.0" => [
+        "Artistic 2.0"
+      ],
+      "BSD-2-Clause" => [
+        "2-clause BSDL",
+        "2-clause"
+      ],
+      "GPL-2.0" => [
+        "GPL-2"
+      ]
+    }
+
+    # Get a map of name => spdx
+    MAP_APACHE2 = Hash[ALIASES.map { |spdx,aliases| aliases.map { |value| [value, spdx] } }[0]]
+    MAP_ARTISTIC2 = Hash[ALIASES.map { |spdx,aliases| aliases.map { |value| [value, spdx] } }[1]]
+    MAP_BSD = Hash[ALIASES.map { |spdx,aliases| aliases.map { |value| [value, spdx] } }[2]]
+    MAP_GPL2 = Hash[ALIASES.map { |spdx,aliases| aliases.map { |value| [value, spdx] } }[3]]
+
+    module_function
+    def map(value)
+      MAP_APACHE2[value] ||  MAP_ARTISTIC2[value] || MAP_BSD[value] ||  MAP_GPL2[value] || value
+    end
+  end
+end
diff --git a/logstash-core/lib/logstash/dependency_report_runner.rb b/logstash-core/lib/logstash/dependency_report_runner.rb
new file mode 100644
index 00000000000..47a894f2933
--- /dev/null
+++ b/logstash-core/lib/logstash/dependency_report_runner.rb
@@ -0,0 +1,17 @@
+require_relative "../../../lib/bootstrap/environment"
+
+if $0 == __FILE__
+  begin
+    LogStash::Bundler.setup!({:without => [:build, :development]})
+  rescue => Bundler::GemfileNotFound
+    $stderr.puts("No Gemfile found. Maybe you need to run `rake artifact:tar`?")
+    raise
+  end
+
+  require "logstash/namespace"
+  require_relative "../../../lib/bootstrap/patches/jar_dependencies"
+  require "logstash/dependency_report"
+
+  exit_status = LogStash::DependencyReport.run 
+  exit(exit_status || 0)
+end