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Showing 594 open source projects for "open source invoice"
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Automate contact and company data extractionGenerate leads at scale without building or maintaining scrapers. Use 10,000+ ready-made tools that handle authentication, pagination, and anti-bot protection. Pull data from business directories, social profiles, and public sources, then export to your CRM or database via API. Schedule recurring extractions, enrich existing datasets, and integrate with your workflows.
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Koha Library Software
Community Koha plus additional patches needed for ByWater Partners
Koha is a free, open-source, web-based library management system (ILS) that helps libraries streamline operations and improve user services. It's used by libraries of all sizes worldwide and is built using library standards and protocols. Koha is a fully featured, scalable library management system with a configurable user interface, adaptable for any library type, and has been translated into many languages. -
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Calibre-Web
Web app for browsing, reading and downloading eBooks stored in Calibre
Calibre-Web is a web app providing a clean interface for browsing, reading and downloading eBooks using an existing Calibre database. User management with fine-grained per-user permissions. User Interface in Brazilian, Czech, Dutch, English, Finnish, French, German, Greek, Hungarian, Italian, Japanese, Khmer, Polish, Russian, simplified and traditional Chinese, Spanish, Swedish, Turkish, Ukrainian. Filter and search by titles, authors, tags, series and language. Support for editing eBook... -
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The Magic of CSS
A CSS course to turn you into a magician
Magic of CSS is an open source educational project by Adam Schwartz that explores advanced CSS concepts through practical lessons. It is structured as a series of chapters that cover topics like the box model, layouts, positioning, typography, and animations. The repository is designed to go beyond basic CSS tutorials, teaching how to harness the language for complex, responsive, and visually appealing designs. -
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33 JS Concepts
33 JavaScript concepts every developer should know
...The repository also encourages contributions, including personal notes, recaps, and translations, making it accessible to developers worldwide. Recognized as one of GitHub’s top open source projects in 2018, it remains a widely used reference for improving JavaScript skills. -
G-P - Global EOR SolutionWith G-P's industry-leading Employer of Record (EOR) and Contractor solutions, you can hire, onboard and manage teams in 180+ countries — quickly and compliantly — without setting up entities.
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Zotero
Tool to help you collect, organize, annotate, cite, and share research
Zotero is a powerful, free, open-source research management application designed to help students, academics, and professionals collect, organize, annotate, cite, and share research sources and materials for papers, projects, or books. It can save web pages, PDFs, books, articles, and more with metadata, automatically extract bibliographic information, and organize items into collections and tag systems, while supporting notes and annotations directly alongside references. ... -
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Realtime Chat Application
Build and deploy a real time chat application
This full-stack tutorial project shows how to build and deploy a real-time chat app using React on the client and Node/Express with Socket.io on the server. It covers the mechanics of establishing WebSocket connections, broadcasting and receiving messages, and maintaining active user rooms. The repository includes scripts and instructions to spin up both client and server quickly so you can experiment locally. It illustrates common patterns like event-driven messaging, joining/leaving rooms,... -
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This repository provides a set of hands-on CSS exercises that accompany the HTML and CSS modules in The Odin Project curriculum. The tasks are designed to be completed at specific points in the course, reinforcing each concept right after it is introduced. Learners are encouraged to use documentation and external resources freely, reflecting real-world workflows rather than rote memorization. Each exercise focuses on practical styling problems, from selectors and specificity to layout...
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Diciotech
Diciotech is a collaborative online tech dictionary
Diciotech is a collaborative online tech dictionary, built with HTML, SASS and JavaScript, and open source. Our mission is to help people of all levels understand terms and concepts related to technology in a clear and simple way. -
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JupyterQuiz
An interactive Quiz generator for Jupyter notebooks and Jupyter Book
...A very hacky solution is available in version 2.7.0a1, which loads MathJax 3 on top of the JupyterLab MathJax version. Use at your own risk! (It can be installed as pip install jupyterquiz==2.7.0a1.) JupyterQuiz is part of my effort to make open source tools for developing modern, interactive textbooks. -
Say goodbye to broken revenue funnels and poor customer experiencesLeanData is a Demand Management solution that supports all go-to-market strategies such as account-based sales development, geo-based territories, and more. LeanData features a visual, intuitive workflow native to Salesforce that enables users to view their entire lead flow in one interface. LeanData allows users to access the drag-and-drop feature to route their leads. LeanData also features an algorithms match that uses multiple fields in Salesforce.
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Utilitarianism.net
Official repository for utilitarianism.net
Utilitarianism.net is an open-source educational platform that provides comprehensive resources on utilitarian ethics. It offers articles, essays, and learning materials to help individuals understand and engage with utilitarian philosophy. -
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Hello JavaScript
Course repository designed to teach JavaScript from scratch in Spanish
hello-javascript is a comprehensive course repository designed to teach JavaScript from scratch in Spanish, pairing source code with hours of video content and hundreds of exercises. It covers the JavaScript language core, from variables and control flow to functions, objects, arrays, and modern ECMAScript features. The project also touches the browser and Node.js ecosystems so learners can understand both client and server contexts. Exercises and lesson organization make it easy to follow... -
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Web Dev for Beginners
About 24 Lessons, 12 Weeks, Get Started as a Web Developer
Web-Dev-For-Beginners is Microsoft’s open source, project-based curriculum for learning web development from scratch. Designed as a 12-week, 24-lesson course, it covers HTML, CSS, and JavaScript fundamentals through hands-on projects like terrariums, browser extensions, and space games. Each lesson includes a mix of pre-lecture quizzes, written content, assignments, challenges, and post-lecture quizzes to reinforce learning. -
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Fanyi
A 🇨🇳 and 🇺🇸 translate tool in your command line
Fanyi is a tool for translating words between the Chinese and English languages, right in your command line. It’s a good supportive tool for learning and reading the Chinese language from English, or the other way around. All translation data is fetched from iciba.com and fanyi.youdao.com, and with each translation comprehensive and related samples are given for better understanding and proper usage. There are translations for words as well as sentences, and in Mac/Linux bash, words can even... -
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Comprehensive Rust
This is the Rust course used by the Android team at Google
Comprehensive Rust is an open source training course developed by Google to provide a complete introduction to the Rust programming language. Originally created for Google engineers, it has since been released publicly for the broader developer community. The course is structured into modular lessons that cover the fundamentals of Rust, including ownership, lifetimes, traits, generics, and error handling, before progressing to advanced topics like concurrency, async programming, unsafe Rust, and FFI. ... -
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LLM Course
Course to get into Large Language Models (LLMs)
LLM Course is a hands-on, notebook-driven path for learning how large language models work in practice, from data curation to training, fine-tuning, evaluating, and deploying. It emphasizes reproducible experiments: each step is demonstrated with runnable code, clear dependencies, and references to commonly used open-source models and libraries. Learners get exposure to multiple adaptation strategies—LoRA/QLoRA, instruction fine-tuning, and alignment techniques—so they can choose approaches that fit their hardware and budgets. The materials also cover inference optimization and quantization to make serving LLMs feasible on commodity GPUs or even CPUs, which is crucial for side projects and startups. ... -
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Marksheet
Free tutorial to learn HTML and CSS
MarkSheet is a beginner-friendly curriculum for learning HTML and CSS from first principles, organized as a readable online handbook. It explains core building blocks—elements, attributes, selectors, the box model, positioning—and connects them to the mental models needed for real layouts. The writing style aims to demystify jargon and teach a consistent vocabulary so learners can understand documentation and tutorials elsewhere. It includes diagrams and compact examples that illustrate... -
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Learn Git Branching
An interactive git visualization and tutorial
LearnGitBranching (LGB) is a Git repository visualizer, sandbox, and interactive tutorial platform that teaches Git concepts through visualization and gamified challenges. Instead of only typing commands into the terminal, users see a live commit tree update dynamically as they experiment with branching, merging, rebasing, and more. It features both sandbox mode for free exploration and structured levels to guide learners through Git fundamentals and advanced workflows. Designed entirely... -
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Easings.net
Easing Functions Cheat Sheet
Easings .net is a visualization and reference project dedicated to easing functions, which are widely used in animations and transitions to create natural motion. Instead of linear changes, easing functions help define how values accelerate or decelerate over time, resulting in smoother and more dynamic effects. The project provides a clear, interactive showcase of common easing equations such as quadratic, cubic, quartic, and elastic functions. It is a valuable resource for developers and... -
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Docker Curriculum
A comprehensive tutorial on getting started with Docker
Docker Curriculum is a hands-on tutorial that teaches Docker from first principles to practical deployment through a sequence of guided exercises. It starts with images and containers, then layers on volumes, networks, and multi-container composition so learners grasp how pieces fit together. The material emphasizes doing over reading: you build images, run services, and push to registries as you go, reinforcing concepts with real commands. It also connects Docker to everyday developer... -
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ReactJS Interview Questions
List of top 500 ReactJS Interview Questions & Answers
ReactJS Interview Questions is a curated collection of over 500 commonly asked questions and answers about React and its ecosystem. The repository is designed as a preparation resource for developers preparing for interviews involving React, Redux, React Router, React Native, and related JavaScript technologies. It covers a broad spectrum of topics, from the fundamentals of React components and state management to advanced concepts like hooks, performance optimization, and design patterns.... -
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Complete-Python-Bootcamp
The complete Python bootcamp guide
Complete-Python-Bootcamp is a structured learning repository designed to walk learners from the very basics of Python to more advanced, real-world topics. It is organized into multiple numbered folders that mirror a course syllabus, starting with Python basics and control flow, then moving into data structures, functions, and modules. As you progress, you encounter practical concerns such as file handling, exception handling, and working with classes and objects, which are essential for... -
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Preguntas de entrevista para React
Questions about React for job interviews
Preguntas de entrevista para React is a comprehensive Spanish-language resource containing typical React interview questions organized from beginner to expert level. The repository is not just a list of questions: it includes detailed explanations in Spanish, making it useful as both an interview prep guide and a deeper learning reference.The content is structured in sections (beginner, intermediate, expert), covering everything from “What is React?” and JSX basics to advanced topics such as... -
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CSS Reference
Fee visual guide to the most popular CSS properties
CSS Reference is a human-friendly, example-driven reference for CSS that focuses on how properties behave in practice rather than only listing their syntax. Each entry explains what a property does, shows concise examples, and illustrates the visual result so you can internalize concepts quickly. The reference highlights common pitfalls and “gotchas,” helping you avoid surprises when mixing layout modes like Flexbox and Grid or when dealing with overflow and positioning. It favors clarity... -
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Open Information Systems for Emergency Services (Open ISES) is a community of software developers, paramedics, EMTs, law enforcement & fire fighters working together to create open source software & training materials for the emergency service community.
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JavaScript Primer
JavaScript Primer
JavaScript Primer is an open-source book designed to provide a comprehensive introduction to JavaScript, covering fundamental concepts and best practices.
