Antechinus: A programmer's editor that supports color-coded syntax of the C# programming language. By C Point Pty Ltd.
Blue Ink: A C# application generating software program that decrease development time for database enabled web applications. [Commercial]
C# Rapid Development Kit: A series of advanced collections and more than 50 generic algorithms that are designed to complement, not replace, the basic features found in the .NET Framework. [Commercial]
C# Refactory: A refactoring, metrics and productivity add-in for Microsoft Visual Studio.NET.
C-Sharpener For VB: A Visual Studio addin that converts VB.Net projects to C# projects. [Commercial, free conversion service for open source projects]
Clover.NET: Clover.NET provides code coverage for .NET projects. Measures method, statement and branch coverage. reports in XML, HTML or via Visual Studio Plugin. A suite of NAnt tasks are provided. [Free for Open Source and Non-commercial projects]
db4o: An object database written in C# for the .NET platform. Also exist Java version.
DotGnu Portable .NET: An open-source C# compiler and libraries.
Editor Hub - C#: List of editors with C# support with reviews. Sorted by platforms and licenses.
eXtensible C#: Provides attribute-based declarative assertions, partial based code verification and obfuscation for C#. Free download.
Free Compiler Writing Tools: Provides C# source for tools written in the tradition of lex and yacc, redesigned in an object-oriented way. By Malcolm Crowe.
HKPGEN Plugins Generator: Visually design plugins for HTML-Kit and automatically generate source code in .NET C#
HTML-Kit: Highly customizable free C# editor. Includes syntax highlighting and lookup of online and offline help references.
Improve C# plugin for Eclipse: Free open-source plugin for Eclipse (itself a free and open-source development environment) with syntax highlighting, content assistant (intellisense for C# keywords), and ability to compile code from within the IDE.
Instant C#: Convert VB.NET code to C# code at the project and code snippet levels. Description, sample screenshots, and ordering information. By Tangible Software Solutions Inc.
MonoDevelop: A project to port SharpDevelop to Gtk#.
Nini: A software configuration library written in 100% C# for the .NET Framework. This software contains a concise API for abstracting the access of multiple configuration types: INI, .NET config files, registry, XML files, and command-line options. [Open source, MIT License]
OCL (Open CLI Library): Intel Labs C# implementation of portions of the CLI (Common Language Infrastructure) runtime library as defined in the draft ECMA CLI specification.
OpenGL for C#: Provides C# wrapper for OpenGL & SDL along with some tools.
ORM.NET: Object-relational mapping and code generation tool for C# generates 100% of the data access code. Auto generate wrappers for stored procuedures.
Prof-It for C#: A standalone profiler for C# that measures execution frequencies for each statement while keeping the instrumentation of the source code to a minimum. [Open source, GPL]
RapTier: A template-based C#, VB.NET, and SQL code generator for multi-tier development. [Shareware]
Sharp Develop: Free C# editor.
Tangible Architect: Generates the data access layer for C# application and the database schema from within Visual Studio.NET .
TCDesigner Code Generator: Generate C# source code and SQL Server stored procedures for entire data tier. Excellent performance without DataAdapters.
Xceed Dot NET Products: C# zip and streaming compression components for the Microsoft .NET framework.