JinnIde is a plugin that allows using Jinni Prolog, now also hosted here on this site (with open source license!), within the confines of an IDE integrated in JEdit.
ProDT is a Prolog Integrated Development Environment (IDE) aiming to be as rich in functionality as the Eclipse's java IDE, and to support any standard Prolog implementation. Currently is being supported SWI Prolog, B-Prolog and XSB Prolog
rIDE is an IDE aimed at beginners, meant for use mainly in classrooms. It supports C++, Python, Prolog, Lisp, Whitespace, and LOLCODE, with syntax highlighting and quick-compile for each.