Post here some handy links to free game development resources for your fellow Game Jam participants.

Some resources to help you started:

• Blender, for 3D  models and can also do 2D and/or sculpting: https://www.blender.org
• Freesound.org: https://freesound.org | License: https://freesound.org/help/faq/#wait-this-is-all-free
• 8bit Sound Generator: https://www.bfxr.net/ | License: You have full rights to all sounds made with bfxr, and are free to use them for any purposes, commercial or otherwise.
• Kenny Assets: https://kenney.nl/assets | License: CC0 1.0 Universal
• Color Scheme Generator: http://colormind.io/
• Color Scheme Designer: https://paletton.com/
• Open Game Art: https://opengameart.org | License: https://opengameart.org/content/faq#q-how-to-credit
• Piskel,  a free online editor for animated sprites & pixel art:  https://www.piskelapp.com/
• Mixamo, animations: https://www.mixamo.com/
• Tree It, free tree creation tool: http://www.evolved-software.com/treeit/treeit 
• WOWIE Asset Pack (by Jonas Tyroller): https://jonas-tyroller.itch.io/wowie-pack
• LabChirp, a powerful and versatile sound effect generator: https://labbed.itch.io/labchirp
• Kay Lousberg free Game Assets: https://kaylousberg.com/game-assets
• ChipTone, a free tool for generating sound effect: https://sfbgames.itch.io/chiptone | License: All sounds created using ChipTone are free to use for any purpose, commercial or otherwise, under the CC0 licence. 
• Beepbox, BeepBox is an online tool for sketching and sharing instrumental music: https://www.beepbox.co
• Material maker, for procedural materials: https://rodzilla.itch.io/material-maker
• Audacity for editing audio: https://www.audacityteam.org
• Game idea generator, for if you're completely stuck on an idea: http://ygd.bafta.org/resources/game-idea-generator
• Ship Mixer, create ships that perfectly fit the shmup style:  https://kenney.itch.io/ship-mixer (License see link)
• Creature Mixer, create characters that perfectly fit the platformer style:  https://kenney.itch.io/creature-mixer (License see link)
• Some amazing free CC0 low poly places/characters/props: https://elbolilloduro.itch.io/
• Texture tool:  https://www.codeandweb.com/texturepacker
• Collection of low poly stuff: https://github.com/Miziziziz/Retro3DGraphicsCollection

Inkscape: a free and open source vector graphics creation tool.
https://inkscape.org/

I'm well,  not great at art, inkscape has been fairly easy to pick up and start using and producing polished looking content. I've found it easier to start making vector graphics because of the use of basic shapes without having to worry about scale and level of detail since I can output at any piece of art at any resolution. It's fairly easy to get into but there is also lot's of features and depth so I think it can be used to make professional stuff without being overwhelming like Blender or Photoshop.
Also a bonus of vector graphics is it's super easy to make adjustments since your dealing with objects you can manipulate, not pixels you edit, so you never like ruin your project. Obviously a style choice but for bad artists like me, it's something.

There are some useful tutorials available too. Just look up inkscape tutorial on youtube.

Here is a cool doritos salad man I made. Don't steal him, or if you do he has to say the line "Hay everybody, I'm just tagging in here for a short snack, see ya'll next time!"

LibreSprite is an open source version of AseSprite, the popular sprite editing program
AseSprite used to be published under a GNU General Public License and LibreSprite is essentially an old version of AseSprite before they changed to a paid model.

https://libresprite.github.io/#!/