Are you looking for a tool which can help you generate data for your SQL Server and help you in local/dev performance testing and which is easy to use and understand and most importantly available for free trial.
SQL Data Generator
This is a tool provided by RedGate and available for free trial however to use it for long time you need to purchase a licence.
SQL Data Generator is a fast, simple tool for generating realistic test data.
It can instantly provide generators based on table and column names, field length, data types, and other existing constraints. They can be customized to meet your requirements.
