See the deprecated plugins page.
“Announces the currently playing song with a xosd overlay. 0.17.0: Download it [here], 0.16.0...GMPC PLUGIN OSD
“The following plugins are deprecated: Stop button plugin. since 0.16.0, Server Statistics. since...GMPC PLUGIN DEPRECATED
“Shows some statistics from mpd. Not maintained anymore as this feature is now integrated into...Server statistics