Top CARD GitHub Repositories & Tools (2026)

Open-source, self-hosted note-taking tool built for quick capture. Markdown-native, lightweight, and fully yours.

Firefly III: a personal finances manager

C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.

Self-hosted mail server for your own domain: SMTP/IMAP/POP3, CardDAV/CalDAV, React webmail and admin console, one-command Docker Compose.

The open-source observability database. One columnar engine for metrics, logs, and traces, on object storage.

Render OG images and paged PDFs from JSX, HTML, and CSS. No headless browser. Runs on Node.js, Cloudflare Workers, browsers, and Rust.

DAVx⁵ is an open-source CalDAV/CardDAV suite and sync app for Android. You can also access your online files (WebDAV) with it.

dnsx is a fast and multi-purpose DNS toolkit allow to run multiple DNS queries of your choice with a list of user-supplied resolvers.

Search Engine Optimization (SEO) for Ruby on Rails applications.

XMage - Magic Another Game Engine

🗂 Kanban-style project & personal management tool for Nextcloud, similar to Trello

The Firefly III Data Importer can import data into Firefly III

🗓 A modern, simple, feature-packed, fully translatable admin interface for sabre/dav based on Symfony 7 and Bootstrap

Offline-first workout tracker for strength and cardio, with progress graphs, rest timers, and custom themes. Built with Flutter.

JL is a program for looking up Japanese words and expressions.

Generate :octocat: Stats as like Terminal Interface with typing effects dynamically for your profile Readme

Any source (PDF, video, web, audio, text) to interactive learning package with quizzes, flashcards and spaced repetition. One command, 12-section study guide.

A beautiful, custom Home Assistant calendar card

Adyen iOS Drop-in and Components

Berlin (BVG) and Brandenburg (VBB) transport widget for Home Assistant