Open source. Open possibilities.

Spruce CSS is an open-source, lightweight Sass-based CSS design system and framework offering variables, mixins, functions, few utility classes and CSS custom property theming with dark mode.

Zettlr is a privacy-first, open-source publication workbench designed for academic and professional writing, featuring Zettelkasten support and deep integration with reference managers.

A Django-based open-source website project for Christ College of Engineering (CCE), India, serving as an informational portal for the institute.

ArchPlayer is a lightweight, single-file HTML local media viewer that allows users to play video files directly in a web browser without installation.

Bootstrap is a widely used open-source front-end framework for building responsive, mobile-first websites. It provides compiled and source CSS, JavaScript components, utility classes, and theming tools, with options for install via npm, Composer, NuGet and more.

PyScript is an open source platform that runs Python in the browser using Pyodide (CPython) and MicroPython compiled to WebAssembly. Add a stylesheet and script tag, then write Python in HTML script tags to build rich browser apps on any device.

A professional front-end starter template for building fast, robust, and adaptable websites or web apps, refined over a decade by a large community.

TW Elements is an MIT-licensed component library for Tailwind CSS, offering 500+ interactive UI components and 117+ design blocks with dark mode support, theming options, and quick installation for personal and commercial use.

Hyper is an open-source terminal emulator built on open web standards, offering an extensible, customizable command-line experience with plugins and themes.

Open-source alternative to DocSend for HTML documents. Send tracked links to HTML decks, reports, or proposals and see section-level dwell time, viewer details, and download logs. Supports self-hosting on Cloudflare + Supabase.

EasySpider (易采集) is a free visual browser automation and web scraping tool with a no‑code GUI, command‑line mode, flowchart‑style task design, looping, conditional branches, OCR, custom JS/Python, MySQL output, scheduled and parallel runs, IP pool switching, and AGPL‑3.0 license; featured at WWW 2023 with a patent and a Zhejiang University thesis.

Parcel is a zero-configuration web build tool that supports HTML, CSS, JavaScript and many asset types out of the box, with a built-in dev server, hot reloading, Rust-based compilation, caching, and automatic production optimization.

Pyxel is a retro game engine for Python with simple, console-inspired limits such as 16 colors and four sound channels. It is MIT-licensed, free to use, and aimed at making pixel-art-style game creation approachable.

htmx is a small, dependency-free JavaScript library that lets you issue AJAX requests, use CSS transitions, WebSockets and Server Sent Events directly from HTML attributes, enabling hypertext-driven interfaces without heavy frontend frameworks.

Flowbite is an open-source UI component library built on Tailwind CSS, offering interactive components like modals, dropdowns and datepickers driven by data attributes, with vanilla JS APIs, TypeScript types, RTL support and bindings for React, Vue, Svelte and Angular.

HyperFrames is an open-source framework that converts HTML, CSS, and seekable animations into deterministic MP4 videos, specifically designed for AI coding agents and automated pipelines.

Prettier is an opinionated code formatter that parses code and reprints it with consistent rules, taking maximum line length into account and wrapping when needed. It can run in editors on save, pre-commit hooks, or CI.

WeasyPrint is a Python-based HTML/CSS to PDF rendering engine that helps developers generate professional documents like reports, invoices, and tickets from web markup.

Docling parses diverse document formats including PDF, DOCX, PPTX, XLSX, HTML, EPUB, images, audio, and more, with advanced PDF understanding, export to Markdown/JSON, OCR, VLM support, and integrations with LangChain, LlamaIndex, and other AI frameworks for RAG and agentic workflows.

A tool for writing and generating interactive gamebooks from Markdown and YAML, with builds for HTML, PDF, EPUB, and optional MOBI.