You are free to use any development tools when contributing to the WP-e-Commerce project. Be sure to consult the coding standards and code quality page when setting up your tools to be compatible with the project.
Below are some tools that you might want to consider.
GitHub, but you know that becuase you are here :)
jetBrains offers a complementary license of phpStorm to active WP-e-Commerce project contributors. Contact the repository administrators for more information.
