Looking at the list of existing plugins
Usually, the first place to look at is the list of available plugins. If your Jenkins instance is up to date, you can browse through the currently available options in your Jenkins Available plugins page.
Go to Manage Jenkins, then select Manage Plugins, and select the Available tab for an ever-growing list of plugins to choose from.
Note that this screen allows you to filter by specific words and provides a brief description of each plugin.
Alternatively, the Jenkins Plugins page provides an easier-to-browse and slightly more detailed listing:
https://wiki.jenkins-ci.org/display/JENKINS/Plugins
This lists the plugins grouped by their general category or function and also hosts links to the corresponding Jenkins home page for each plugin. In turn, the home page provides further information that includes links to the source code for that plugin on GitHub, which you can browse online or download locally.
If you are able to find something similar to your...