The following is a massive collection of game development tools and resources with one thing in common, they are all free (or free to start).  If you have a recommendation, please let us know on our Discord Channel.

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• 2D Graphics Applications
• 3D Graphics Applications
• 2D Game Engines
• 3D Game Engines
• 2D Graphics Resources
• 3D Graphics Resources
• Animation Tools
• Audio Tools
• Game Frameworks
• Game Libraries
• Integrated Development Environments
• Misc Game Tools
• Text Editors
• Voxel Applications