The subject of this thesis is an analysis of plugin technology. The goal of the thesis is to characterization of basics of this technology in common and with focus on application on NetBeans platform and its integrated development environment and further demonstration of the technology in form developing exemplary NetBeans plugin. Opening part is dedicated to theoretical analysis of plugin principals, its purposes in soft-ware development and use cases for current software applications. The theoretical part follows by describing use cases of plugins for NetBeans platform and bringing thought for designing, developing and distributing new plugins. The subsequent part is dedicated to implementation of NetBeans plugin to demonstrate technology and methods described. The result of implementation is a NetBeans plugin allowing advanced editing of documentation commentary from Java source code inside WYSISYG HTML editor just from NetBeans environment. The resulting plugin, source codes and documentation is included attachment of this thesis. This thesis expands collection of theses dedicated to subject of NetBeans platform and those theses are referred in the text.