Opossum is a search engine for semantic Web services that uses approximation methods in order to discover single and composed services.
See http://dori.technion.ac.il for a living demo of the search engine.

• Development Status: 4 - Beta
• Environment: Other Environment
• Intended Audience: Developers, End Users/Desktop
• Interface: API, HTTP
• License: GNU Lesser General Public License (LGPL)
• Natural Language: English
• Operating System: OS Independent
• Output language: HTML
• Programming Language: Java
• Semantic Web Tool Categories: Query, Reasoner, Visualization