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NLog is a free logging platform for .NET with rich log routing and management capabilities. It makes it easy to produce and manage high-quality logs for your application regardless of its size or complexity
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Quartz.NET is a full-featured, open source job scheduling system that can be used from smallest apps to large scale enterprise systems.
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The Gallio Automation Platform is an open, extensible, and neutral system for .NET that provides a common object model, runtime services and tools (such as test runners) that may be leveraged by any number of test frameworks.
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An ultra-lightweight, inversion of control container compiler framework
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NHibernate is a mature, open source object-relational mapper for the .NET framework. It's actively developed , fully featured and used in thousands of successful projects.
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Fluent, XML-less, compile safe, automated,convention-based mappings for NHibernate.
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FluentMigrator is a database migration framework for .NET written in C#.