Deep-dive explainers of popular open source projects for developers and product managers

Welcome to Learn from OSS

Learn from OSS helps new developers and product managers understand how popular open source projects are built — the architecture, workflows, information flows, dependencies, and design decisions — without cloning a single repository.

Each explainer covers a complete project across four dimensions:

Architecture — System design, layers, and how components connect
Workflows — Key user journeys traced through the codebase
Dependencies — Technologies used and why they were chosen
How It's Built — Repo structure, build pipeline, and deployment

Choose a Project

✈️ Plane

Open-source project management (Jira alternative) built with React, Django, PostgreSQL, and real-time CRDT collaboration.

🚀 Open SaaS

Production-ready SaaS starter template on Wasp (React + Node.js + Prisma) with auth, payments, AI, and admin dashboard.

🏢 Twenty

The #1 open-source CRM (Salesforce alternative) with custom objects, workflow automation, email sync, and modern UI. Built with NestJS, React, and PostgreSQL.

💰 Midday

AI-powered business assistant for freelancers — bank sync (20,000+ institutions), invoicing, time tracking, and financial AI. Built with Next.js, Hono, Supabase, and Drizzle.

Explainers