SQL Data Generator 

SQL Data Generator is an application developed by Red Gate Software Ltd to aid professionals in creating large volumes of data in SQL Server Management Studio. All is done by just a few mouse clicks and database engineers are able to generate meaningful test data at row level fast and easy.

The program comes wrapped in a modern interface and it's colored with a black and white theme. The menu icons have the proper size and the text font style seems well-chosen. There are no skin themes or advanced customizations and, at heavy loads, the buttons become laggy.

When it comes to its features, SQL Data Generator embeds custom python generators - for data creation -, supports import of data from existing data sources and includes more than 60 built-in generators for complex configurations options.

Moreover, users can disable triggers and constraints to avoid interfering with database logic and can use Column data generation to generate data in one column based on the data in another.

All things considered, SQL Data Generator is a comprehensive tool for generating realistic test data and it provides users with lots of useful features to complete their daily tasks. It may be a bit pricey but there's no much to complain about it.