🇪🇺 💶 Generate e-invoices (E-Rechnung in German) conforming to EN16931 (Factur-X/ZUGFeRD, UBL, CII, XRechnung aka X-Rechnung) from LibreOffice Calc/Excel data or JSON.

A curated list of open source software for Europe — institutions, regulations, standards, and cross-border infrastructure

Tablebase probing tool and tablebase access code

Master programming by recreating your favorite technologies from scratch.

UCI Chess Engine

JavaScript chess move generator with strictly legal moves. Integrated check/checkmate/stalemate detection. Two implementations: x88 & Bitboards. Tactical analysis: captures, hanging pieces, safe sq…

Lichess Bot

Github page of Soomi chess engine, written in Go.

Chess tournament manager, standard C++ 11

Professional Speedcubing/Training Timer

Serverless Invoicing for Tech Enthusiasts

Code lists UNTDID, EAS as well as UN/ECE Recommendation N°20 and N°21 for JavaScript / TypeScript

a Disqus alternative

Free & Open-Source Invoice Generator - No Sign-Up, No Ads, Instant PDF Export, 100% In-Browser, and Fully Customizable Templates. ⭐ Star the repo if you like it

phoss SMP - a Peppol and OASIS BDXR SMP Server; EC eDelivery compliant

GNU Backgammon, rebuilt for the web. Lean, clean, and browser-ready.

Create and modify PDF documents in any JavaScript environment

A TypeDoc theme based on Material 3.

Setup Perl environment Action

A complete solution to package and build a ready for distribution Electron app with “auto update” support out of the box

A lightweight Node.js module for creating ZUGFeRD-compliant invoices.

The modular and type safe schema library for validating structural data 🤖

Resources like syllabus or FAQ

The peppol.helger.com website

NordVPN Linux client

Chessboard component. Chessground Svelte wrapper.

FREE Bootstrap 5 Theme for Your Documentation/Project

Anki Reviews Visualizer Addon

Text::Markdown::Discount