AS2Secure is a PHP library that allows you to send and receive AS2 (Applicability Statement 2) messages from partners. The project is split into two parts: a client to send one or more documents to a partner and a server to receive one or more documents from a partner. Its main features are asyncronous and syncronous MDN, partner setup, digital signatures, message encryption, secure transport (using OpenSSL), support for SSL client authentication, and multiple attachments (AS2 1.2).
Webswell Business Hub is a business-to-business integration solution for interchange of business documents. It supports EDI standards, Web Services integration, and a (BPEL-based) business process engine that allows you to define and run business processes over multiple parties with multiple business documents. It has a Web-based (AJAX) monitoring interface that allows messaging and business processes execution monitoring and management. Companies or units connected to the Business Hub are able to interchange their documents with others even when they use incompatible data formats and support different messaging protocols. For instance, an invoice sent as an EDI document via HTTPS can be received as an XML invoice via SMTP. Being transmitted through the Business Hub, the business document can be transformed, translated, validated, or verified automatically.