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NUCLEUS is a base theme first released with Drupal 7 by ThemeBrain. The goal of this base theme is to provide a solid foundation for web development geeks to develop a theme quick and easy. Having a fast learning curve is the inflection point for UX/UI designers, Back-End and Front-End Developers.
A starter or "base" theme is one that typically has very little style and is designed to give you a head start building your own unique theme, usually using Drupal's subtheming.
This is a list of themes that currently identify themselves as starter themes. At time of writing some of these projects were in early alpha release or still in development. You will need to check the releases for each project.