T4 Awesome

The easiest way to use T4 Templates inside Visual Studio.

4 Alternatives To T4 Awesome

Codesmith

CodeSmith is a template-based code generator tool. It features a syntax nearly identical to ASP.

Devart T4 Editor

Devart T4 Editor is a powerful Visual Studio add-in for editing T4 templates with intellisense, syntax highlighting, code formatting and outlining, etc.
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Entity Developer

Entity Developer is a powerful ORM designer for ADO.

LLBLGen Pro

LLBLGen Pro: Using databases in your .NET code made easy. The entity modeling solution for Entity Framework, LLBLGen Pro Runtime Framework, NHibernate and Linq to SQL.