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title: Buildpacks
owner: Buildpacks
<strong><%= modified_date %></strong>
Buildpacks provide framework and runtime support for apps. Buildpacks typically examine your apps to determine what dependencies to download and how to configure the apps to communicate with bound services.
When you push an app, Cloud Foundry automatically detects an appropriate buildpack for it. This buildpack is used to compile or prepare your app for launch.
<p class="note"><strong>Note</strong>: Cloud Foundry deployments often have limited access to dependencies.
This limitation occurs when the deployment is behind a firewall, or when administrators want to use local mirrors and proxies.
In these circumstances, Cloud Foundry provides a <a href="">
Buildpack Packager</a> app.</p>
##<a id='about-buildpacks'></a>About Buildpacks
For general information about buildpacks, see <a href="./using-buildpacks.html" class="subnav">About Buildpacks</a>.
##<a id='system-buildpacks'></a>System Buildpacks
Cloud Foundry includes a set of system buildpacks for common languages and frameworks.
This table lists the system buildpacks.
<table border="1" class="nice" >
<th>Supported Languages, Frameworks, and Technologies</th>
<th>GitHub Repository</th>
<td><a href="./binary/index.html" class="subnav">Binary</a></td>
<td><a href="">Binary source</a></td>
<td><a href="./go/index.html" class="subnav">Go</a></td>
<td><a href="">Go source</a></td>
<td><a href="./java/index.html" class="subnav">Java</a></td>
<td><p>Grails, Play, Spring, or any other JVM-based language or framework</p></td>
<td><a href="">Java source</a></td>
<td><a href="./dotnet-core/index.html" class="subnav">.NET Core</a></td>
<td><p>.NET Core</p></td>
<td><a href="">.NET Core source</a></td>
<td><a href="./node/index.html" class="subnav">Node.js</a></td>
<td><p>Node or JavaScript</p></td>
<td><a href="">Node.js source</a></td>
<td><a href="./php/index.html" class="subnav">PHP</a></td>
<td><p>Cake, Symfony, Zend, Nginx, or HTTPD</p></td>
<td><a href="">PHP source</a></td>
<td><a href="./python/index.html" class="subnav">Python</a></td>
<td><p>Django or Flask</p></td>
<td><a href="">Python source</a></td>
<td><a href="./ruby/index.html" class="subnav">Ruby</a></td>
<td><p>Ruby, JRuby, Rack, Rails, or Sinatra</p></td>
<td><a href="">Ruby source</a></td>
<td><a href="./staticfile/index.html" class="subnav">Staticfile</a></td>
<td><p>HTML, CSS, JavaScript, or NGINX</p></td>
<td><a href="">Staticfile source</a></td>
<td><a href="./nginx/index.html" class="subnav">NGINX</a></td>
<td><a href="">NGINX source</a></td>
<td><a href="./hwc/index.html" class="subnav">HWC</a></td>
<td><a href="">HWC source</a></td>
##<a id='community-buildpacks'></a>Community Buildpacks
You can find a list of unsupported, community-created buildpacks here:
<a href="">
##<a id='developing-buildpacks'></a>Customizing and Developing Buildpacks
For information about customizing existing buildpacks and developing new buildpacks, see <a href="./developing-buildpacks.html" class="subnav">Customizing and Developing Buildpacks</a>.
For information about updating and releasing a new version of a Cloud Foundry buildpack
through the Cloud Foundry Buildpacks Team Concourse pipeline, see <a href="./buildpack-ci-index.html">Using CI for Buildpacks</a>.
You can use this as a model when working with Concourse to build and release new versions of your own buildpacks.