kotofetch is a Rust-based CLI tool that displays Japanese quotes in the terminal with extensive customization options. It features built-in quote collections (anime, proverbs, haiku, lyrics, and yojijukugo) and supports importing Anki decks via AnkiConnect. The tool offers various display modes including furigana (ruby text) rendering, animations (typewriter, scramble, slide), and flexible text styling. The application architecture is modular, with separate modules for command-line parsing, configuration management, quote importing, and display rendering. The display module handles complex text layout, including inline furigana annotations, Unicode-aware wrapping, and terminal boxing with optional animations. Key reusable components include the furigana parsing and formatting logic (which handles conversion between Anki's [reading] syntax and kotofetch's (reading) syntax and renders ruby text with proper alignment) and the AnkiConnect client (which provides a robust interface for fetching and converting Anki notes into kotofetch-compatible quote files).
EasyInvoicePDF is a free, open-source, browser-based invoice generator that creates PDF invoices with live preview, no sign-up required, and no ads. Built with Next.js (App Router), React 19, TypeScript, Tailwind CSS, and shadcn/ui, it runs entirely client-side for the public editor—invoice data stays in localStorage and is never uploaded to a server. The application supports 10 languages, 120+ currencies, two PDF templates (default and Stripe-inspired), QR codes, multi-page PDFs, and shareable compressed URLs. A private server-side API (Bearer token + Upstash rate-limited) handles monthly recurring invoice generation via Trigger.dev cron, uploading PDFs to Google Drive, emailing via Resend, and sending Telegram notifications. The codebase also includes extensive SEO landing pages, a changelog, a founder page, and comprehensive testing (Vitest unit tests, Playwright e2e with PDF screenshot baselines). Architecture: The app uses two root layouts—unprefixed English-only routes (/) and locale-prefixed routes (/[locale]) for i18n via next-intl. The main invoice form is a large client component with react-hook-form and Zod validation, debounced autosave, and template/language switching. PDF rendering uses @react-pdf/renderer on the client for live preview and on the server for automation. External dependencies include Upstash Redis (rate limiting, queue), Resend (email), Google Drive (archive), Telegram (notifications), Sentry (error tracking), Umami (analytics), and Trigger.dev (scheduled tasks). The repository also contains a rich ecosystem of agent skills (Vercel React best practices, composition patterns, SEO audit, etc.) used in development workflows. Key data flows: User fills form → state stored in localStorage and optionally shared via compressed URL → PDF preview rendered client-side via @react-pdf/renderer → download or share. For monthly automation: Trigger.dev cron triggers server-side PDF generation → upload to Google Drive → email via Resend → Telegram notification. The backend API also supports a preview endpoint for sample PDFs and a Telegram webhook for on-demand generation.
Invoice Ninja is a full-featured open-source invoicing and billing platform designed for small to medium businesses. It handles the complete lifecycle of invoices, quotes, credits, purchase orders, payments, and expenses. The system supports multi-tenant SaaS and self-hosted deployments with per-company database isolation, and integrates with over 20 payment gateways (Stripe, PayPal, Mollie, GoCardless, etc.). It provides client and vendor portals for self-service, along with extensive reporting, CSV export, and e-invoicing capabilities (Peppol, Verifactu, France e-reporting). The application follows a monolithic MVC architecture built on a custom PHP framework (Illuminate) similar to Laravel. It uses an event-driven architecture with domain events and listeners for side effects (email, webhooks, activity logging). Background jobs are queued for async processing. The frontend uses Blade templates, Livewire components, and a separate React app for some admin panels. The API is RESTful with OpenAPI documentation. Key entry points are HTTP controllers under app/Http/Controllers, with request validation classes. Core data flows involve creating entities through factories, persisting via repositories, and triggering events that listeners handle. Payment flows go through abstract payment drivers that encapsulate gateway-specific logic. The system also includes extensive reporting, CSV export, and e-invoicing (Peppol, Verifactu, France e-reporting). External dependencies include a relational database (MySQL/PostgreSQL), Redis for caching and queues, Elasticsearch for search, and various third-party APIs for payment processing, tax calculation (ZipTax), bank integration (Nordigen, Yodlee), email delivery (Mailgun, Postmark, Brevo), and e-invoicing gateways (Storecove, Qvalia).