SmartPaster – (FREE) Copy/Paste code generator for strings
AnkhSvn – (FREE) SVN Source Control Integration for VS.NET
VisualSVN Server – (FREE) Source Control
ReSharper – IDE enhancement that helps with refactoring and productivity
CodeRush – Code gen macros on steroids
Refactor – Code refactoring aid
CodeMaid (FREE) – Code cleanup, organization and complexity analysis
CodeSmith – Code Generator
GhostDoc – (FREE) Simple code commenting tool
DXCore (FREE) and its many awesome plugins: DxCore Community Plugins, CR_Documentor, CodeStyleEnforcer, RedGreen
TestDriven.Net – (FREE/PAY) Unit Testing Aid
Reflector – (PAY) Feature rich .Net Disassembler Reflector AddIn’s
Web Deployment Projects – Provides additional functionality to build and deploy Web sites and Web applications (source).
StudioTools – (FREE) Navigation assistant, code metrics tool, incremental search, file explorer in visual studio and tear off editor windows. Moved from old site (archive.org) to new site and discontinued.