diff --git a/lib/plugins/gravatar/gitignore b/lib/plugins/gravatar/gitignore
deleted file mode 100644
index 4ebc8ae..0000000
--- a/lib/plugins/gravatar/gitignore
+++ /dev/null
@@ -1 +0,0 @@
-coverage
diff --git a/plugins/additionals/assets/javascripts/eslintignore b/plugins/additionals/assets/javascripts/eslintignore
deleted file mode 100644
index d304d63..0000000
--- a/plugins/additionals/assets/javascripts/eslintignore
+++ /dev/null
@@ -1,5 +0,0 @@
-# eslint ignore file
-*.js
-!additionals*.js
-!noreferrer.js
-!tooltips.js
diff --git a/plugins/additionals/assets/stylesheets/stylelintignore b/plugins/additionals/assets/stylesheets/stylelintignore
deleted file mode 100644
index c234968..0000000
--- a/plugins/additionals/assets/stylesheets/stylelintignore
+++ /dev/null
@@ -1,4 +0,0 @@
-# stylelint ignore file
-bootstrap*
-*.map
-*.min.css
diff --git a/plugins/additionals/codeclimate.yml b/plugins/additionals/codeclimate.yml
deleted file mode 100644
index fe12bce..0000000
--- a/plugins/additionals/codeclimate.yml
+++ /dev/null
@@ -1,22 +0,0 @@
-engines:
-  fixme:
-    enabled: false
-  eslint:
-    enabled: true
-  rubocop:
-    enabled: true
-  duplication:
-    enabled: true
-    config:
-      languages:
-      - "ruby"
-ratings:
-  paths:
-  - "**.css"
-  - "**.erb"
-  - "**.js"
-  - "**.rb"
-exclude_paths:
-- "test/"
-- "assets/javascripts/"
-- "assets/stylesheets/jquery.*"
diff --git a/plugins/additionals/eslintrc.yml b/plugins/additionals/eslintrc.yml
deleted file mode 100644
index f0f5725..0000000
--- a/plugins/additionals/eslintrc.yml
+++ /dev/null
@@ -1,17 +0,0 @@
-env:
-  browser: true
-  jquery: true
-extends: 'eslint:recommended'
-rules:
-  indent:
-    - error
-    - 2
-  linebreak-style:
-    - error
-    - unix
-  quotes:
-    - error
-    - single
-  semi:
-    - error
-    - always
diff --git a/plugins/additionals/rubocop.yml b/plugins/additionals/rubocop.yml
deleted file mode 100644
index 7fcb391..0000000
--- a/plugins/additionals/rubocop.yml
+++ /dev/null
@@ -1,49 +0,0 @@
-Rails:
-  Enabled: true
-
-AllCops:
-  TargetRubyVersion: 2.2
-  TargetRailsVersion: 5.2
-
-Metrics/AbcSize:
-  Max: 65
-
-Metrics/BlockLength:
-  Max: 60
-
-Metrics/ClassLength:
-  Enabled: false
-
-Metrics/CyclomaticComplexity:
-  Max: 20
-
-Metrics/LineLength:
-  Max: 140
-
-Metrics/MethodLength:
-  Max: 60
-
-Metrics/ModuleLength:
-  Enabled: false
-
-Metrics/PerceivedComplexity:
-  Max: 25
-
-Rails/SkipsModelValidations:
-  Enabled: false
-
-Rails/CreateTableWithTimestamps:
-  Enabled: false
-
-# app/model/application_record.rb is missing in redmine, we can't use ApplicationRecord
-Rails/ApplicationRecord:
-  Enabled: false
-
-Style/AutoResourceCleanup:
-  Enabled: true
-
-Style/Documentation:
-  Enabled: false
-
-Style/ExpandPathArguments:
-  Enabled: false
diff --git a/plugins/additionals/slim-lint.yml b/plugins/additionals/slim-lint.yml
deleted file mode 100644
index aea15c3..0000000
--- a/plugins/additionals/slim-lint.yml
+++ /dev/null
@@ -1,39 +0,0 @@
-linters:
-  LineLength:
-    max: 140
-  RuboCop:
-    ignored_cops:
-      - Layout/AlignArray
-      - Layout/AlignHash
-      - Layout/AlignParameters
-      - Layout/BlockEndNewline
-      - Layout/EmptyLineAfterGuardClause
-      - Layout/FirstParameterIndentation
-      - Layout/IndentArray
-      - Layout/IndentationConsistency
-      - Layout/IndentationWidth
-      - Layout/IndentHash
-      - Layout/MultilineArrayBraceLayout
-      - Layout/MultilineAssignmentLayout
-      - Layout/MultilineBlockLayout
-      - Layout/MultilineHashBraceLayout
-      - Layout/MultilineMethodCallBraceLayout
-      - Layout/MultilineMethodCallIndentation
-      - Layout/MultilineMethodDefinitionBraceLayout
-      - Layout/MultilineOperationIndentation
-      - Layout/TrailingBlankLines
-      - Layout/TrailingWhitespace
-      - Lint/BlockAlignment
-      - Lint/EndAlignment
-      - Lint/Void
-      - Metrics/BlockLength
-      - Metrics/BlockNesting
-      - Metrics/LineLength
-      - Naming/FileName
-      - Rails/OutputSafety
-      - Style/ConditionalAssignment
-      - Style/FrozenStringLiteralComment
-      - Style/IdenticalConditionalBranches
-      - Style/IfUnlessModifier
-      - Style/Next
-      - Style/WhileUntilModifier
diff --git a/plugins/additionals/travis.yml b/plugins/additionals/travis.yml
deleted file mode 100644
index 7c7aa27..0000000
--- a/plugins/additionals/travis.yml
+++ /dev/null
@@ -1,49 +0,0 @@
-language: ruby
-
-rvm:
-  - 2.5.3
-  - 2.4.5
-  - 2.3.8
-
-env:
-  - REDMINE_VER=4.0-stable DB=postgresql
-  - REDMINE_VER=3.4-stable DB=postgresql
-  - REDMINE_VER=4.0-stable DB=mysql
-  - REDMINE_VER=3.4-stable DB=mysql
-
-sudo: true
-
-addons:
-  postgresql: "9.6"
-  apt:
-    sources:
-      - mysql-5.7-trusty
-    packages:
-      - mysql-server
-      - mysql-client
-
-before_install:
-  - export PLUGIN_NAME=additionals
-  - export REDMINE_GIT_REPO=git://github.com/redmine/redmine.git
-  - export REDMINE_PATH=$HOME/redmine
-  - export BUNDLE_GEMFILE=$REDMINE_PATH/Gemfile
-  - export RAILS_ENV=test
-  - git clone $REDMINE_GIT_REPO $REDMINE_PATH
-  - cd $REDMINE_PATH
-  - if [[ "$REDMINE_VER" != "master" ]]; then git checkout -b $REDMINE_VER origin/$REDMINE_VER; fi
-  - ln -s $TRAVIS_BUILD_DIR $REDMINE_PATH/plugins/$PLUGIN_NAME
-  - cp $TRAVIS_BUILD_DIR/test/support/additional_environment.rb $REDMINE_PATH/config/
-  - cp $TRAVIS_BUILD_DIR/test/support/database-$DB-travis.yml $REDMINE_PATH/config/database.yml
-
-before_script:
-  - if [[ "$DB" == "mysql" ]]; then mysql -e "use mysql; update user set authentication_string=PASSWORD('travis_ci_test') where User='root'; update user set plugin='mysql_native_password';FLUSH PRIVILEGES;"; fi
-  - if [[ "$DB" == "mysql" ]]; then mysql_upgrade -ptravis_ci_test; fi
-  - if [[ "$DB" == "mysql" ]]; then service mysql restart; fi
-  - bundle exec rake db:create db:migrate redmine:plugins:migrate
-
-script:
-  - export SKIP_COVERAGE=1
-  - if [[ "$REDMINE_VER" == "master" ]]; then bundle exec rake redmine:plugins:test:units NAME=$PLUGIN_NAME; fi
-  - if [[ "$REDMINE_VER" == "master" ]]; then bundle exec rake redmine:plugins:test:functionals NAME=$PLUGIN_NAME; fi
-  - if [[ "$REDMINE_VER" == "master" ]]; then bundle exec rake redmine:plugins:test:integration NAME=$PLUGIN_NAME; fi
-  - if [[ "$REDMINE_VER" != "master" ]]; then bundle exec rake redmine:plugins:test NAME=$PLUGIN_NAME RUBYOPT="-W0"; fi