There are 2 repositories under geany-plugins topic.
A JSON formatter prettifier, minifier and validator plugin for Geany editor
Plugin for Geany editor - Favourites, json_reformat, vertical sidebar & more
The flyweight IDE - Compiler Optimized Builds
Collection of Plugins made for the purpose of making Geany more extensible (autoprefixer,advance-new-file, etc...)
A generic SQL formatter prettifier plugin for Geany editor
A unix timestamp to string converter plugin for Geany
Free Pascal bindings for Geany's plugin API
Cobalt color scheme from Pluma ported to Geany IDE
Base64 converter plugin for Geany