Papyrus is aiming at providing an integrated and user-consumable environment for editing any kind of EMF model and particularly supporting UML and related modeling languages such as SysML and MARTE. Papyrus provides diagram editors for EMF-based modeling languages amongst them UML 2 and SysML and the glue required for integrating these editors (GMF-based or not) with other MBD and MDSD tools.
Papyrus also offers a very advanced support of UML profiles that enables users to define editors for DSLs based on the UML 2 standard. The main feature of Papyrus regarding this latter point is a set of very powerful customization mechanisms which can be leveraged to create user-defined Papyrus perspectives and give it the same look and feel as a "pure" DSL editor.
Papyrus provides a very advanced support for UML profiles enabling support for "pure" 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.
Papyrus is graphics but also textual. It is hence possible to edit model elements using contextual text editors enabling syntax highlight, completion and content assist. It is also a custumizabled feature of Papyrus.
Following this link, you will find the Papyrus cinema corner.
Papyrus team has released the version 0.9.0. It can be runned eiher on Juno 4.2 or 3.8 (By default, Eclipse propose to download Juno 4.2) you can download it here or using the Modeling Eclipse Package, using its discovery interface.