There's no need to remove Sharepoint from your solution shopping list any more even if your workflow needs are very demanding - Skelta BPM & Sharepoint Accelerator transforms SharePoint into a very comprehensive platform indeed

Targeted at enterprises, SharePoint Workflow Accelerator is a 100% Web-based application that extends advanced workflow functionality to Microsoft® SharePoint Portal Server 2003 and Microsoft® Windows® SharePoint Services, enabling building of complex document based collaborative solutions. In doing so, it maintains the usage characteristics, look and feel of the SharePoint Portal Server in full measure. In effect, SharePoint Workflow Accelerator serves as a bridge between Microsoft® SharePoint Portal Server 2003 and Skelta’s fully embeddable .NET workflow engine, Skelta Workflow.NET 2004. Based on core Microsoft® technologies, Skelta Workflow.NET 2004 leverages Windows® Server 2003 and SQL Server capabilities for networking, transaction and data management, and scalability.

SharePoint Workflow Accelerator - Features Enables building, deployment and management of complex workflows from anywhere using the easy and intuitive Web based process designer. No programming knowledge needed Provides instant enterprise-wide workflow capabilities for SharePoint Portal Server and SharePoint Windows Services Integrates seamlessly with SharePoint sites, and allows workflows to be invoked from SharePoint's document libraries, forms libraries and generic lists Enables dynamic modification of business processes without programming knowledge Allows monitoring progress of workflows through Web parts Empowers process administrators to access and modify SharePoint document libraries metadata during workflow execution Provides a complete audit trail of activities inside a workflow Uses SharePoint item lists to enable process administrators to dynamically select workflows Offers a rich set of SharePoint Actions that inherit and manipulate SharePoint metadata during the workflow process Enables users to perform a variety of SharePoint tasks for extended document sharing through the workflow process. Allows process administrators to select a workflow for execution Comes with robust security routines with module-wise and action-wise permissions for a given user or user group Provides for display of workflow status and reports using built-in Web Parts Enables initiation and routing of workflows based on contents in InfoPath 2003 forms Allows workflows to be directly invoked from custom task lists. With the product supporting Active Directory®, tasks can be delivered directly to a SharePoint task list, which users can access to process tasks assigned to them Permits receiving of emails and SMS messages as part of the workflow process, extraction of their content and routing them to appropriate resources Support for Active Directory® ensures correct identification and authentication of users involved as participants in workflow processes from within the SharePoint environment. As a further safeguard, users can only participate in processes for which they are authorized Allows integration with Active Directory and third-party LDAP directories, or can use SharePoint's own database as resource object Enables custom attributes for resources associated with a workflow to be specified - for instance, setting up approval limit for an assistant manager Offers complete audit trail of activities within a workflow. Audit information includes: user ID, date & time, and actions performed on various modules