These are the officially supported plugins for emesene. To install these plugins, download the tarball or zipball, extract the contents of the emesene-emesene-supported-plugins folder into the emesene plugin folder (listed below) and enable them in the emesene preference window.

The Emesene plugins folder is located at: (replace USERNAME with your username on your computer

Windows XP: C:\Documents and Settings\USERNAME\Application data\emesene\emesene2\plugins
Windows Vista/7: C:\Users\USERNAME\AppData\Roaming\emesene\emesene2\plugins
Linux: ~/.config/emesene2/plugins (OR /home/USERNAME/.config/emesene2/plugins for another user)
for 2.11.4 and 2.11.5 ~/.config/emesene2/plugins does not work, instead use /usr/share/emesene/emesene/plugins
Mac: ~/Library/Application Support/emesene2/plugins

To see information on how to make a plugin, take a look at the wiki here: https://github.com/emesene/emesene/wiki/Plugin-How-To