October is an important month for open source software and if you're a game developer, you may be wondering how you can join in on the fun.

In this article, I've compiled some of the best open source game development projects I could find on GitHub that are marked with the hacktoberfest tag.

I'll be adding to this list throughout the month so if you have any projects to suggest, please leave me a comment below.

Note: I tried to grab screenshots but not all projects had them readily available. All credit for the images in this post goes to the project developers.

1. OpenRCT2

A recreation of the popular game RollerCoaster Tycoon 2.

Languages: C++

2. Cataclysm: Dark Days Ahead

A post-apocalyptic turn-based survival game.

Languages: C++

3. League Sandbox

The game server repo for the League Sandbox project for League of Legends.

Languages: C#

4. Amethyst Game Engine

A fast and efficient game engine built with Rust.

Languages: Rust

5. Flame

A game engine built with Flutter.

Languages: Dart

6. Bevy

A game engine built with Rust.

Languages: Rust

7. SameBoy

A Game Boy and Game Boy Color emulator.

Languages: C

8. Work Adventure

A 16-bit video game that emulates a workplace.

Languages: TypeScript, Svelte, HTML

9. PursuedPyBear

A game engine written in Python.

Languages: Python

10. CyberCode Online

A browser and mobile MMORPG game with a fun premise.

Languages: TypeScript

11. Gosu

A 2D game development library.

Languages: C++, Ruby

12. PGM

A PVP Game Manager for Minecraft.

Languages: Java

13. SuperStarFighter

An arcade combat party game developed with Godot.

Languages: GDScript

14. PokéClicker

A fast-paced Pokemon themed clicker game.

Languages: TypeScript, HTML

15. Ancient Beast

A turn-based strategy game.

Languages: JavaScript

16. Terasology

A voxel-based game inspired by Minecraft.

Languages: Java

17. Dungeon Revealer

An app for playing pen and paper games like Dungeons and Dragons.

Languages: TypeScript

18. Excalibur

A game engine for making 2D games using HTML5 canvas.

Languages: TypeScript

Thank you for reading! If you found this article useful, please feel free to reach out on Twitter or Instagram .