No. 2 of 32 ·Electronic Invoicing Software

Holodeck B2B

Windows · Mac · Linux

Freedom report

Three barsScore 6.5

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely3 of 6 device platforms
DocumentedPlans, terms and facts published

Holodeck B2B is ranked #2 of 32 in electronic invoicing software on Freedom251. It runs on Linux, macOS, Windows. There is a free plan.

Holodeck B2B plans and pricing

All plans

Holodeck B2B Free Open-source software under GNU GPL 3 · Java runtime 11 or later required holodeck-b2b.org · 4 Oct 2026

Compared on electronic invoicing software

Peppol access: Yes
API access: Yes
Deployment: on-premise

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The record

Purpose: Holodeck B2B is open-source software for B2B messaging that implements the OASIS ebXML Messaging 3 and AS4 specifications.
Message exchange: It supports one-way and two-way message exchange using push and pull patterns.
Message size: It supports files and attachments up to 2 GB.
Monitoring: Command-line and graphical interfaces are available for gateway monitoring.
Integrations: File-based backend integration is included; REST API integration is available as an extension, and custom backends such as Web Services and JMS can be built using the API.
AS2 extension: An open-source AS2 extension enables one gateway to send and receive both AS2 and AS4 messages, with the protocol selected in the P-Mode.
Security: The feature page lists message signing and encryption using WS-Security 1.1.1, certificate trust stores, OCSP checks, and AS4 non-repudiation of receipt.
Compliance: The maker says Holodeck B2B is AS4 compliant and lists e-SENS/CEF eDelivery, ENTSOG/ENTSOE, EESSI, and Superstream profile compliance.
License: Version 7.0 is released under GNU GPL 3; the maker says LGPL3-licensed interfaces are included for connecting to closed-source systems through those interfaces.
Runtime requirement: The binary package does not include a Java runtime and requires JRE version 11 or later.
Support: The maker offers a support contract providing help directly from the developers.
Intended use: The maker describes the product as well suited to serve as the AS4 messaging component in an eDelivery solution.
Price from: Free

Where it ranks on Freedom251

Best Electronic Invoicing Software in 2026#2 of 32

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Sources

holodeck-b2b.org· checked 4 Oct 2026
holodeck-b2b.org/features/· checked 4 Oct 2026
holodeck-b2b.org/download/extensions/· checked 4 Oct 2026
holodeck-b2b.org/download/· checked 4 Oct 2026