Expensify/App

Blender is a free, professional-grade 3D creation tool that handles everything from building 3D models and characters to animating them, adding special effects, and rendering final visuals — all in one package. It's the open-source alternative to expensive commercial 3D software like Maya or Cinema 4D, used by indie creators, studios, and game developers worldwide.

why it matters: With nearly 20,000 stars and over 1,400 contributors, Blender has become the default 3D production tool for budget-conscious teams, making high-quality 3D content creation accessible without licensing fees that can run thousands of dollars per seat. For founders building in gaming, film, virtual reality, or AI-generated media, Blender's open-source pipeline and active ecosystem represent a cost-effective foundation for content production workflows.

Space Station 14 is an open-source multiplayer game where players navigate paranoia, chaos, and social dynamics aboard a space station — a modern rebuild of the beloved cult classic Space Station 13. With nearly 1,500 contributors, it is a fully community-driven project that anyone can host or expand with custom content.

why it matters: With over 5,500 forks, this project demonstrates massive grassroots demand for community-owned, moddable gaming experiences — a model that challenges traditional closed game publishing. For builders, it showcases how open-source infrastructure combined with passionate communities can sustain complex, long-lived interactive products without a commercial studio behind them.

This repository contains the official user manual and reference guides for Godot Engine, a free and open-source tool for building video games that runs on multiple platforms. The documentation covers everything from getting started to advanced game-building techniques, and can be read online or downloaded for offline use.

why it matters: Godot is one of the fastest-growing alternatives to expensive commercial game engines, and with nearly 1,900 contributors to its documentation alone, it signals a massive and active developer community rallying around an open-source option. For founders and investors, this represents a shift in the game development market where indie studios and small teams can build professional games without licensing fees, lowering barriers to entry and enabling new business models.

Holidays is a Python library that tells you exactly which days are official public holidays in any of 250 countries and their regions, updated and calculated on demand. Instead of manually maintaining holiday calendars or paying for a holiday data service, developers can simply ask the library whether a given date is a holiday anywhere in the world.

why it matters: Any product that involves scheduling, payroll, e-commerce delivery dates, or customer communications needs to account for holidays — getting this wrong means missed deadlines, failed payments, or poor user experiences across global markets. With 250 countries supported and nearly 2,000 stars on GitHub, this is becoming the de facto standard for holiday logic, meaning teams building internationally can skip a surprisingly tricky data problem entirely.