Rocket.BI

Rocket.BI is a free, open-source, web-based business intelligence solution specifically designed for analytical databases. It enables data analysts and business users alike to easily integrate different data sources, perform advanced data analysis, ad hoc, and more. With an easy-to-use editor, you can create personalized reports, build interactive business dashboards and generate actionable business insights. Rocket.BI also allows collaboration as working together with other people in the organization.

Adding a description to a project's documentation to elaborate on a certain point, mostly referred to as a README file (check this guide on how to write a good README file).
Giving guidance on a specific project and how to use it.
Adding sample output to show how the code works.
Writing in-depth tutorials for the project.
Adding translation for a project.
Answering questions about a project.