List of websites where you can find sprites, music, sound effects for your games and game examples, templates, 3rd party libraries and tools to help you with game development.

• gametemplates.itch.io (Free)(GDevelop 5 updated)
• itch.io/game-assets (Free & Paid)
• State machine Combo (Template Free)State Machine combo
• ulisesfreitas.itch.io (Free)(GDevelop templates for download)

• Kenney.nl (Free)
• Lospec (Free and Paid)
• gameart2d.com (Free and Paid)
• spriters-resource.com (Free)
• gamedeveloperstudio.com (Free and Paid)
• craftpix.net (Free and Paid)
• supergameasset.com (Free and Paid)
• gamedevmarket.net (Free and Paid)

• Unsplash.com (Free)
• deviantart.com (Free - Check license before use)

• incompetech.com (Free)
• soundimage.org (Free)
• bluezone-corporation.com (Free)
• sounds-resource.com (Free)
• freesound.org (Free)
• Gamesounds (Free some with License)

• opengameart.com (Free)
• vg-resource.com (Free)
• gamedevmarket.net (Free and Paid)

• Spriter (Paid)
• Pencil2D (Free)
• DragonBones (Free)
• Synfig (Free)

• Gimp (Free)
• Paint.NET (Free)
• Krita (Free)

• Inkscape (Free)
• Affinity Designer (Paid)

• PikoPixel (Free)
• Piskel (Free) (Bundled with GDevelop 5)
• Pixelaria (Free)
• GraphicsGale (Free)
• Grafx2 (Free)
• Aseprite (Paid or download the source and compile yourself)
• Pixatool (Paid)
• Libresprite (Open source) (Like a free version of Aseprite)

• SpriteCutter (Spritesheet cutter)
• TexturePacker (Pack individual images in to spritesheet)
• Spriteilluminator (Illuminate sprites with dynamic lights)
• Assetforge (Create custom sprites from 3D objects)
• 3D2Sprite (Create sprites from 3D models)
• Blender (Create custom sprites and animations with 3D modelling)
• Anim8or (Create animated sprites from animated 3D models)
• Shoebox (Free sprite packer)

• Audacity (Free - Audio editing and converting)
• Bfxr (Free - Procedural sound effects)
• Acapela Box (Paid - Text to Voice converter)
• Balabolka (Free - Text to Voice converter)
• Vocaloid (Paid - Text to Voice converter, Virtual singer)

• XnConvert (Free - batch image converter)
• Converseen (Free - batch image converter)
• RIOT Image (Free Image compressor optimizer)

• ResponsiveVoice (Text to Speech synthesiser)
• PlayerIO (Online Multiplayer Service)
• WOW Scores (Leaderboards API for GDevelop 5)
• Crimson Games IO (Game Publisher & Leaderboards API)

The GDevelop 4 Wiki also has an extensive list of resources and tools, which is still to be incorporated in this wiki (login and edit if you feel like doing it).

Resources for download: http://wiki.compilgames.net/doku.php/gdevelop/tutorials/freeresources

Useful software: http://wiki.compilgames.net/doku.php/gdevelop/tutorials/usefulsoftwares