Open source AS4 messaging

Holodeck B2B is open-source software for B2B messaging, implementing the OASIS specifications for ebXML Messaging version 3 and the AS4 profile.

Holodeck B2B 2.1

A major update for Holodeck B2B, the open source AS4 message service handler.  This latest release adds support for Multi-hop messaging, and event framework and a Trust store amongst other things. It’s feature-rich, fast and reliable. Holodeck B2B is e-SENS and ENTSOG compliant and fully AS4 compliant.


  • Java based
  • small & light weight
  • well documented
  • flexible
  • stand-alone
  • easy to connect with
  • fully compliant with the AS4 standard
  • runs on most platforms
  • more features
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