qpixel

QPixel provides a web‑based platform where users can create and join multiple communities, each organized into categories and supporting various post types such as questions, answers, and articles. Content is authored in Markdown with live preview, and the system includes MathJax rendering, image uploads, and customizable licensing. Voting mechanisms and a modified scoring algorithm allow controversial content to be highlighted, while user privileges are tied to activity levels.

The software is built on Rails and powers the public Codidact site, but it can be self‑hosted as a standalone installation. It supports hosting several distinct communities on a single server, and administrators can tailor the appearance and behavior through a high degree of customization. The codebase is open source, released under the AGPL‑3.0 license, and includes a free tier without subscription requirements.

Developers and community managers who need a flexible, self‑hosted Q&A system can deploy QPixel using the provided installation guide. Ongoing development is tracked via CI pipelines, code coverage reports, and a public issue tracker, and contributions are welcomed through the project's contribution guidelines.