Skelta BPM.NET Developer Edition not only provides the process abstraction layer, it offers a rapid application development framework.  
Skelta BPM.NET is an easy-to-integrate embeddable BPM framework that enables developers to quickly create workflow-enabled applications / products. Skelta BPM.NET is a web based embeddable workflow engine for developers, written completely in C# and SOAP wrapped for platform independence.

Skelta BPM.NET 2007 provides a robust and scalable web-based rapid application development framework without requiring any client-side installations.

Application Development Features

User interface design

• Forms Designer
• Completely customizable interfaces
• Out-of-the-box connectors for InfoPath
• Seamless interface with SharePoint documents, libraries and lists

Business Logic Layer

• Integrated solution for process analysis, modeling, execution and monitoring
• Construct and modify rules within existing software using the simple click and drop interface
• Support for COM, VBScript.NET & JScript.NET
• Enable end users to customize an embedded workflow
• Human Workflow Services
• Queue management for automatic task dispatch

Application Integration
100% embeddable workflow framework for rapid integration

• Built around a set of drag and drop ASP.NET Web Controls
• Customize the entire User Interface by changing simple HTML templates (this hides the existence of Skelta BPM.NET from the end user)
• Connectivity with any database such as Oracle, MS SQL, or Active Directory
• Allow end users to customize an embedded workflow
• Execute business rules written in COM, and run scripts in languages like VBScript.NET & JScript.NET
• Construct and modify rules within existing software using the simple click and drop interface
• Written in C# and SOAP for platform independence 
• Architecture which enables easy application development on Microsoft Windows Workflow Foundation

XML Variable User Interface

• XML variable interface that makes XML data input to workflows easier
• Quickly create XML Schemas for XML variables using the intuitive user interface
• Import existing XML schemas
• Manage the variables throughout the process through XNL Navigator  
• Define SharePoint Lists as XML List Variables

Out-of-the-box connectors

• Integrate with InfoPath, SharePoint, BizTalk, and ERP using out-of-the-box connectors.

Database Connectivity

• Support for ADS, LDAP and other user directories
• Connectivity with any database such as Oracle, MS SQL, or Active Directory

Key Benefits

• Rapid application development
• Lowers development costs
• Separation of process abstraction layer from core application functions for easy customization
• Greater flexibility for end-user management of business processes
• Provides instant capabilities for anytime, anywhere access to application processes