Create a custom installation of Eclipse with Oracle Tools, by choosing the desired OEPE release and the required capabilities.
Launch Network Installer
These distributions include Eclipse with Oracle Tools already installed. Just download and unzip.
Developers with an existing Eclipse installation can use OEPE plugin repository to install the required Oracle Tools.
GlassFish Tools, a component of OEPE, is distributed under the terms of EPL and the source code is available for download.
Mars: GlassFish Tools 15.8 Source Code
Neon: GlassFish Tools 16.2 Source Code