Plugins

Tools > User config files > plugins

Creating own plugins

Plugins are .NET DLLs, which means that they should be developed in a .NET language, such as C#. You will need HaxeDevelop installed in order to compile and test plugins. Looking at existing plugins source is a great source for learning the application architecture.

Once your plugin is built, pick the .dll and copy it to HaxeDevelop's Plugins folder (HaxeDevelop > Tools > User Config Files). Open or restart HaxeDevelop.

Creating plugins with Haxe/C#

With Haxe you can compile to C#, thus you can write plugins with Haxe.

More info on FlashDevelop.org