PluginInstaller is a plugin designed for eaglercraft that can install plugins from an online repository to your server just with a /install command. This plugin also has an autoupdater so theres no need to constantly redownload the plugin.
The download link is here
Since PluginInstaller runs on an autoupdater, all contributions must be made from pull requests either by forks or branches approved by someone in the darverdevs group and tested before a pull request is made