diff --git a/src/main/scala/app/SystemSettingsController.scala b/src/main/scala/app/SystemSettingsController.scala
index ac915b2..0cef067 100644
--- a/src/main/scala/app/SystemSettingsController.scala
+++ b/src/main/scala/app/SystemSettingsController.scala
@@ -4,10 +4,13 @@
 import SystemSettingsService._
 import util.AdminAuthenticator
 import util.Directory._
+import util.ControlUtil._
 import jp.sf.amateras.scalatra.forms._
 import ssh.SshServer
 import org.scalatra.Ok
 import org.apache.commons.io.FileUtils
+import java.io.FileInputStream
+import plugin.PluginSystem
 
 class SystemSettingsController extends SystemSettingsControllerBase
   with AccountService with AdminAuthenticator
@@ -89,11 +92,28 @@
       val dir = new java.io.File(PluginHome, pluginId)
       if(dir.exists && dir.isDirectory){
         FileUtils.deleteQuietly(dir)
+        PluginSystem.uninstall(pluginId)
       }
     }
     redirect("/admin/plugins")
   })
 
+  get("/admin/plugins/available")(adminOnly {
+    admin.plugins.html.available(getAvailablePlugins())
+  })
+
+  post("/admin/plugins/_install", pluginForm)(adminOnly { form =>
+    val dir = getPluginCacheDir()
+    getAvailablePlugins().filter(x => form.pluginIds.contains(x.id)).foreach { plugin =>
+      val pluginDir = new java.io.File(PluginHome, plugin.id)
+      if(!pluginDir.exists){
+        FileUtils.copyDirectory(new java.io.File(dir, plugin.repository + "/" + plugin.id), pluginDir)
+      }
+      PluginSystem.installPlugin(plugin.id)
+    }
+    redirect("/admin/plugins")
+  })
+
   get("/admin/plugins/console")(adminOnly {
     admin.plugins.html.console()
   })
@@ -103,4 +123,35 @@
     val result = plugin.JavaScriptPlugin.evaluateJavaScript(script)
     Ok(result)
   })
+
+  // TODO Move to PluginSystem or Service?
+  private def getAvailablePlugins(): List[SystemSettingsControllerBase.AvailablePlugin] = {
+    val dir = getPluginCacheDir()
+    if(dir.exists && dir.isDirectory){
+      PluginSystem.repositories.flatMap { repo =>
+        val repoDir = new java.io.File(dir, repo.id)
+        if(repoDir.exists && repoDir.isDirectory){
+          repoDir.listFiles.filter(d => d.isDirectory && !d.getName.startsWith(".")).map { plugin =>
+            val propertyFile = new java.io.File(plugin, "plugin.properties")
+            val properties = new java.util.Properties()
+            if(propertyFile.exists && propertyFile.isFile){
+              using(new FileInputStream(propertyFile)){ in =>
+                properties.load(in)
+              }
+            }
+            SystemSettingsControllerBase.AvailablePlugin(
+              repo.id,
+              properties.getProperty("id"),
+              properties.getProperty("author"),
+              properties.getProperty("url"),
+              properties.getProperty("description"))
+          }
+        } else Nil
+      }
+    } else Nil
+  }
+}
+
+object SystemSettingsControllerBase {
+  case class AvailablePlugin(repository: String, id: String, author: String, url: String, description: String)
 }
diff --git a/src/main/scala/plugin/JavaScriptPlugin.scala b/src/main/scala/plugin/JavaScriptPlugin.scala
index 7984c32..739e035 100644
--- a/src/main/scala/plugin/JavaScriptPlugin.scala
+++ b/src/main/scala/plugin/JavaScriptPlugin.scala
@@ -67,12 +67,15 @@
 
   def define(id: String, author: String, url: String, description: String) = new JavaScriptPlugin(id, author, url, description)
 
-  def evaluateJavaScript(script: String): Any = {
+  def evaluateJavaScript(script: String, vars: Map[String, Any] = Map.empty): Any = {
     val context = JsContext.enter()
     try {
       val scope = context.initStandardObjects()
       scope.put("PluginSystem", scope, PluginSystem)
       scope.put("JavaScriptPlugin", scope, this)
+      vars.foreach { case (key, value) =>
+        scope.put(key, scope, value)
+      }
       val result = context.evaluateString(scope, script, "<cmd>", 1, null)
       result
     } finally {
diff --git a/src/main/scala/plugin/PluginSystem.scala b/src/main/scala/plugin/PluginSystem.scala
index 1956ec6..e2477c1 100644
--- a/src/main/scala/plugin/PluginSystem.scala
+++ b/src/main/scala/plugin/PluginSystem.scala
@@ -5,6 +5,7 @@
 import org.slf4j.LoggerFactory
 import java.util.concurrent.atomic.AtomicBoolean
 import util.Directory._
+import util.ControlUtil._
 import org.apache.commons.io.FileUtils
 
 /**
@@ -16,6 +17,7 @@
 
   private val initialized = new AtomicBoolean(false)
   private val pluginsMap = scala.collection.mutable.Map[String, Plugin]()
+  private val repositoriesList = scala.collection.mutable.ListBuffer[PluginRepository]()
 
   def install(plugin: Plugin): Unit = {
     pluginsMap.put(plugin.id, plugin)
@@ -27,25 +29,46 @@
     pluginsMap.remove(id)
   }
 
+  def repositories: List[PluginRepository] = repositoriesList.toList
+
   /**
    * Initializes the plugin system. Load scripts from GITBUCKET_HOME/plugins.
    */
   def init(): Unit = {
     if(initialized.compareAndSet(false, true)){
+      // Load installed plugins
       val pluginDir = new java.io.File(PluginHome)
       if(pluginDir.exists && pluginDir.isDirectory){
         pluginDir.listFiles.filter(f => f.isDirectory && !f.getName.startsWith(".")).foreach { dir =>
-          val file = new java.io.File(dir, "plugin.js")
-          if(file.exists && file.isFile){
-            val script = FileUtils.readFileToString(file, "UTF-8")
-            try {
-              JavaScriptPlugin.evaluateJavaScript(script)
-            } catch {
-              case e: Exception => logger.warn(s"Error in plugin loading for ${file.getAbsolutePath}", e)
-            }
-          }
+          installPlugin(dir.getName)
         }
       }
+      // Add default plugin repositories
+      repositoriesList += PluginRepository("central", "https://github.com/takezoe/gitbucket_plugins.git")
+    }
+  }
+
+  def installPlugin(id: String): Unit = {
+    val pluginDir = new java.io.File(PluginHome)
+    val javaScriptFile = new java.io.File(pluginDir, id + "/plugin.js")
+
+    if(javaScriptFile.exists && javaScriptFile.isFile){
+      val properties = new java.util.Properties()
+      using(new java.io.FileInputStream(new java.io.File(pluginDir, id + "/plugin.properties"))){ in =>
+        properties.load(in)
+      }
+
+      val script = FileUtils.readFileToString(javaScriptFile, "UTF-8")
+      try {
+        JavaScriptPlugin.evaluateJavaScript(script, Map(
+          "id"          -> properties.getProperty("id"),
+          "author"      -> properties.getProperty("author"),
+          "url"         -> properties.getProperty("url"),
+          "description" -> properties.getProperty("description")
+        ))
+      } catch {
+        case e: Exception => logger.warn(s"Error in plugin loading for ${javaScriptFile.getAbsolutePath}", e)
+      }
     }
   }
 
@@ -55,6 +78,7 @@
   def globalActions     : List[Action]         = pluginsMap.values.flatMap(_.globalActions).toList
 
   // Case classes to hold plug-ins information internally in GitBucket
+  case class PluginRepository(id: String, url: String)
   case class GlobalMenu(label: String, url: String, icon: String, condition: Context => Boolean)
   case class RepositoryMenu(label: String, name: String, url: String, icon: String, condition: Context => Boolean)
   case class Action(path: String, function: (HttpServletRequest, HttpServletResponse) => Any)
diff --git a/src/main/scala/util/Directory.scala b/src/main/scala/util/Directory.scala
index dac409f..920b22a 100644
--- a/src/main/scala/util/Directory.scala
+++ b/src/main/scala/util/Directory.scala
@@ -36,6 +36,8 @@
 
   val PluginHome = s"${GitBucketHome}/plugins"
 
+  val TemporaryHome = s"${GitBucketHome}/tmp"
+
   /**
    * Substance directory of the repository.
    */
@@ -57,13 +59,18 @@
    * Root of temporary directories for the upload file.
    */
   def getTemporaryDir(sessionId: String): File =
-    new File(s"${GitBucketHome}/tmp/_upload/${sessionId}")
+    new File(s"${TemporaryHome}/_upload/${sessionId}")
 
   /**
    * Root of temporary directories for the specified repository.
    */
   def getTemporaryDir(owner: String, repository: String): File =
-    new File(s"${GitBucketHome}/tmp/${owner}/${repository}")
+    new File(s"${TemporaryHome}/${owner}/${repository}")
+
+  /**
+   * Root of plugin cache directory. Plugin repositories are cloned into this directory.
+   */
+  def getPluginCacheDir(): File = new File(s"${TemporaryHome}/_plugins")
 
   /**
    * Temporary directory which is used to create an archive to download repository contents.
diff --git a/src/main/twirl/admin/plugins/available.scala.html b/src/main/twirl/admin/plugins/available.scala.html
new file mode 100644
index 0000000..0c5cf9a
--- /dev/null
+++ b/src/main/twirl/admin/plugins/available.scala.html
@@ -0,0 +1,35 @@
+@(plugins: List[app.SystemSettingsControllerBase.AvailablePlugin])(implicit context: app.Context)
+@import context._
+@import view.helpers._
+@html.main("Plugins"){
+  @admin.html.menu("plugins"){
+    @tab("available")
+    <form action="@path/admin/plugins/_install" method="POST" validate="true">
+      <table class="table table-bordered">
+        <tr>
+          <th>ID</th>
+          <th>Provider</th>
+          <th>Description</th>
+        </tr>
+        @plugins.zipWithIndex.map { case (plugin, i) =>
+          <tr>
+            <td>
+              <input type="checkbox" name="pluginId[@i]" value="@plugin.id"/>
+              @plugin.id
+            </td>
+            <td><a href="@plugin.url">@plugin.author</a></td>
+            <td>@plugin.description</td>
+          </tr>
+        }
+      </table>
+      <input type="submit" id="install-plugins" class="btn btn-primary" value="Install selected plugins"/>
+    </form>
+  }
+}
+<script>
+$(function(){
+  $('#install-plugins').click(function(){
+    return confirm('Selected plugin will be installed. Are you sure?');
+  });
+});
+</script>
diff --git a/src/main/twirl/admin/plugins/tab.scala.html b/src/main/twirl/admin/plugins/tab.scala.html
index 34d9056..ec3ebf6 100644
--- a/src/main/twirl/admin/plugins/tab.scala.html
+++ b/src/main/twirl/admin/plugins/tab.scala.html
@@ -2,6 +2,6 @@
 @import context._
 <ul class="nav nav-tabs">
   <li@if(active == "installed"){ class="active"}><a href="@path/admin/plugins">Installed plugins</a></li>
-  <li@if(active == "available"){ class="active"}><a href="@path/admin/plugins">Available plugins</a></li>
+  <li@if(active == "available"){ class="active"}><a href="@path/admin/plugins/available">Available plugins</a></li>
   <li@if(active == "console"  ){ class="active"}><a href="@path/admin/plugins/console">JavaScript console</a></li>
 </ul>