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Papyrus is an Open Source UML 2 tool based on Eclipse and licensed under the EPL. It can either be used as a standalone tool or as an Eclipse plugin. Papyrus provides support for Domain Specific Languages and SysML.
Papyrus is a graphical editing tool for UML2 as defined by OMG. Papyrus targets to implement 100% of the OMG specification.
Domain Specific Language (DSL)
Papyrus provides a very advanced support for UML profiles enabling support for "pure" Domain Specific Languages (DSL). Every part of Papyrus may be customized: model explorer, diagram editors, property editors, etc.
Papyrus provides also a complete support to SysML in order to enable model-based system engineering. It includes an implementation of the SysML static profile and the specific graphical editors required for SysML.