I have recently submitted a plugin for approval in the Moodle plugins database. This thread can be used to discuss the plugin. If you wish to preview the plugin, please visit https://github.com/frederic-nevers/moodle-filter_multiembed
The Multi-Embed filter is used to facilitate embedding of third-party content (e.g Prezi, Haiku Deck, etc.). The idea is simple: a teacher copies/pastes a link to an external service (e.g. Prezi) and the filter turns the link into embedded content, automatically. It follows a similar idea to the oEmbed filter.
I constantly add services to the plugin, please feel free to submit ideas for new services here too.