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A web-based helpdesk system for tracking support tickets with built-in billing automation via invoicing integration.

Joomla is an open source content management system for building websites and web applications with flexible user management and multilingual support.

A free CDN for open source JavaScript, CSS, and web fonts that automatically serves the latest versions of npm and GitHub packages.

An open-source API service for compiling and running code in over 60 programming languages, designed for online judges and coding platforms.

JupyterLab is a web-based interactive development environment for notebooks, code, and data, built on the Jupyter architecture.

A self-hosted Kanban board tool for task management and workflow visualization in teams.

A self-hosted, open source project management tool for developers and small teams.

Kantree is a flexible project management and collaboration platform with a Kanban-style interface and custom workflows.

Self-host a private bookmarking and archiving tool that saves web pages, screenshots, and full-page PDFs.

An open source email newsletter tool you can self-host, with a focus on privacy and deliverability.

Live kernel patching for Linux servers without reboots or scheduled maintenance windows.

Kestra is an open-source orchestration platform for scheduling, automating, and monitoring complex workflows across any stack.

KeyCDN is a content delivery network that speeds up global content delivery through edge caching, HTTP/2, and instant purging.

An open source content management system and headless CMS built with Node.js and GraphQL.

Kibitzr is a lightweight change detection and notification tool that watches web pages and files for updates.

Kill Bill is an open source billing and payment platform that handles subscription management, invoicing, and payment orchestration.

Kinto is a lightweight JSON storage service with built-in synchronization, designed for managing settings and data across devices.

A flat-file CMS that lets you build any kind of website without a database, using PHP and Markdown.

Knot DNS is an open source authoritative DNS server designed for high performance, scalability, and compliance with modern DNS standards.

A social publishing platform that turns your website into a private or public social network.