Maintained by Ciro Continisio (GGJ Rome). If you want to add a link, please suggest it here or on Twitter @CiroContns.

About suggestions: There are a million tools out there, but this list is intended to be readable and useful, rather than an encyclopedia of ALL the software in the world. Don’t get annoyed if an obscure tool is not added.

Note: Resources listed here are generally free, though some have paid plans for extra features.

Table of contents

Game Engines

HTML5 / Javascript

Frameworks

Tools

3D Modeling

2D and Vector Graphics

Animation

Other Graphic Tools

Coding

IDEs

Source Control

Audio and Music

Middleware

Task Management

Graphical

Text-based

Assets

3D Models

Textures / 2D Art

Audio

Fonts

Public Domain

Board Games

Miscellaneous

Unity tools

Other

Game Engines

Unity (powerful Asset Store, also check tools below)

Unreal Engine 4 (comes with source code, marketplace)

Cry Engine (comes with source code, marketplace)

Amazon Lumberyard

Scratch (no coding required, great for beginners and kids)

PICO-8 (simple, great for small jams, code examples)

GameMaker (great for beginners + marketplace)

Godot (open source!)

Construct 3 (web-based)

Stencyl (no coding required)

Defold (2D only)

Ren’Py (visual novels)

Twine (text-based games)

Inkle Writer (text-based games)

Adventure Game Studio

IRRLicht

RPG Maker VX Ace Lite (no coding required, 2D, does more than just RPGs)

Bitsy (very simple gameplay, 2D)

HTML5 / Javascript

Canvas Engine - http://canvasengine.net/

CreateJS (HTML5/Javascript libraries) - https://createjs.com/

Box2D (javascript 2D physics library) - http://box2d-js.sourceforge.net/

Phaser - http://phaser.io/

Superpowers - https://sparklinlabs.itch.io/superpowers

Cocos2D HTML5 - http://www.cocos2d-x.org/download

Processing.js (for visual designers) - http://processingjs.org/

p5.js - https://p5js.org/

Frameworks

MonoGame (Open source version of XNA, actively maintained) - http://monogame.net/

Processing (Java) - http://processing.org/

Ogre3D (3D rendering engine) - http://www.ogre3d.org/

LibGDX - http://libgdx.badlogicgames.com/

OpenFL (Flash-like crossplatform API) - http://www.openfl.org/

Box2D (2D physics library) - http://box2d.org/
Chipmunk2D (2D physics library) - https://chipmunk-physics.net/

HaxeFlixel (Haxe) - http://www.haxeflixel.com 

SDL (cross platform API for C/C++) - http://www.libsdl.org/index.php

Love2D (Lua) - http://love2d.org 

Raylib - http://www.raylib.com/

Openframeworks (C++ toolkit) - http://www.openframeworks.cc/

PyGame (Python) - https://www.pygame.org/


Tools

3D Modeling 

Blender - http://blender.org

MagicaVoxel - https://ephtracy.github.io/

2D and Vector Graphics

GIMP (Photoshop-like) -  http://gimp.org

Paint.NET : http://www.getpaint.net/

Krita (digital painting) - https://krita.org/ 

Inkscape (SVG/Vector tool) - http://inkscape.org/
Aseprite -
 http://www.aseprite.org/

Pixlr - http://pixlr.com/editor/

Piskel (Online Pixelart & Sprite Editor) - http://www.piskelapp.com/

Animation

DragonBones (skeletal animation) - http://dragonbones.com/en/index.html

Other Graphic Tools

Tiled (tile editor) - http://www.mapeditor.org/

Texture Packer - http://www.codeandweb.com/texturepacker

Color Oracle (color blindness testing) - http://colororacle.org

Shoebox - http://renderhjs.net/shoebox/
Paletton (color schemes) -
http://paletton.com/

Image optimizer - http://www.imageoptimizer.net/Pages/Home.aspx

TextureGenerator Online - https://cpetry.github.io/TextureGenerator-Online/

Tilemancer (node-based filters tool for tiles) - https://led.itch.io/tilemancer

Coding

IDEs

Eclipse - http://www.eclipse.org/

Visual Studio Community - https://www.visualstudio.com/vs/community/

Monodevelop - http://monodevelop.com/

IntelliJ - http://www.jetbrains.com/idea/

Komodo Edit - http://www.activestate.com/komodo-edit

Collabedit (text editor / chat hybrid with simple syntax highlighting) - http://collabedit.com/

Visual Studo Code (Text editor with some autocomplete) -  https://code.visualstudio.com/

Source Control

Mercurial SCM (software only) - https://www.mercurial-scm.org/

Git (software only) - http://git-scm.com

GitHub (software + hosting) - https://github.com

Bitbucket (mercurial and git hosting) - https://bitbucket.org

Sourcetree (nice visual gui software for git and mercurial): http://www.sourcetreeapp.com/

GitExtensions (similar to Sourcetree, but all FOSS): http://gitextensions.github.io/

Git LFS (Large File Storage, useful for binary objects): https://git-lfs.github.com/

Audio and Music

BFXR (sound tool) - http://bfxr.net

Audacity (Audio / Recording / Music) - http://www.audacityteam.org/download/

Bosca Ceoil (music tool) - https://terrycavanagh.itch.io/bosca-ceoil

Procedural Music - http://abundant-music.com (needs a Midi Renderer)

SynthFont - http://www.synthfont.com (Midi Renderer)

GXSCC - http://www.geocities.co.jp/SiliconValley-SanJose (Midi Renderer)

BeepBox (chiptune) - http://www.beepbox.co

Milkytracker (tracker) - http://www.milkytracker.org

ChipTone (BFXR’s big brother) - http://sfbgames.com/chiptone

LMMS (open-source music making program) - https://lmms.io[a]/

Soundation (music maker) - https://soundation.com/

Music / SFX (Machine learning) https://experiments.withgoogle.com/ai/sound-maker/view/

Middleware

FMOD (free tier) - https://www.fmod.com/

WWISE (free tier) - https://www.audiokinetic.com/products/wwise/

Task Management

Graphical

Trello (project management, bucket list)

HackNPlan (project management, bucket list, time metrics, specific for gamedev)

Murally (pinboard, connects to Google Drive and Evernote)

Realtime Board (pinboard)

Mindmeister (mind mapping)

Lucidchart, Cacoo (diagrams and flowcharts)

Sligrid (pinboard, mind mapping, concept board; sign up with invite code: ggj18)

Notion (notes, wikis and tasks)

Draw.io (diagrams and flowcharts)

Asana (project management)

Text-based

Workflowy (Collaborative list editor, task lists)

Bear (flexible writing app for iPhone, iPad and Mac)


Assets[b]

Everything - http://kenney.nl/

Everything - http://opengameart.org (most models in Blender format)

Everything (compatible with other tech too) - https://assetstore.unity.com/

3D Models

3D models - http://turboSquid.com

3D models - http://www.blendswap.com/

3D models - http://www.sketchfab.com

Very high quality assets - http://devassets.com 

Plenty of lowpoly models - https://poly.google.com/

Textures / 2D Art

Textures - http://www.cgtextures.com

2D sprites and Flash backgrounds (.fla) - http://glitchthegame.com/

2D prototyping assets: http://lunar.lostgarden.com

Textures (only partly free)- http://www.openfootage.net

Audio

Music - http://www.newgrounds.com/audio

Music production - https://www.audiotool.com/

Music production - https://www.soundtrap.com/

Music production (Chip tunes) - http://sfbgames.com/chiptone/

Sound Effects - http://freesfx.co.uk

Sound Effects - http://soundbible.com

Sound Effects - http://freesound.org/

Sound Effects - http://99sounds.org/free-sound-effects/

Sound Effects - https://sonniss.com/gameaudiogdc2017/

Sound Effects - https://sonniss.com/gameaudiogdc2016/

Sound Effects - http://ftpmirror.your.org/pub/misc/sonniss/

Sound Effects - http://wiki.laptop.org/go/Free_sound_samples

Audition SFX - https://offers.adobe.com
Music (and graph paper!!) - http://incompetech.com

Text-To-Speech - https://soundoftext.com/

Free Music Archive (great CC music library) - http://freemusicarchive.org/

(tip: you can search CC BY music using filters in Soundcloud or Youtube)

Fonts

Fonts - http://www.fontsquirrel.com

Google Fonts - http://www.google.com/fonts

Fonts - http://www.1001freefonts.com

Fonts - http://www.fontriver.com

Fonts - http://www.1001fonts.com

Da Font - http://dafont.com/

Public Domain

New York Public Library - http://digitalcollections.nypl.org/
NASA Audio Library -
https://archive.org/details/nasaaudiocollection

Board Games

Board game tools - http://www.rptools.net/


Miscellaneous

Unity tools

Fungus - Package which is great for building narrative in Unity - http://fungusgames.com/ 

ProBuilder (BSP style level editing tools) - http://www.procore3d.com/probuilder/

Procedural terrain tool for Unity: http://code.google.com/p/unityterraintoolkit/downloads/list

Other

PixelProspector (gamedev big lists)

GIFCam (free recorder that outputs optimized GIFs)

EZGif (online GIF animation editor and maker)

JSFiddle (collaborative tool for web projects)

Github Gists (collection of useful scripts)

OBS (cross-platform streaming/screen capture)

[a]virustotal.com reported a trojan in the Windows version of lmms.

[b]Most jams prohibit the use of any assets made prior to a jam's start time.