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MonoDevelop is a cross platform IDE mostly aimed at Mono/.NET developers
Quartz Enterprise Scheduler .NET
The versatile procedural text engine
Cake (C# Make) is a cross platform build automation system.
A 100% native C# implementation of ZeroMQ for .NET
Npgsql is the .NET data provider for PostgreSQL.
NUnit 3.0 Framework
Cecil is a library to generate and inspect .NET programs and libraries.
A dependency manager for .NET with support for NuGet packages and Git repositories.
A cross-platform plotting library for .NET
A friendly substitute for .NET mocking frameworks.