As part of the ongoing sets of practice game jams that we have been doing, I have started creating a free resource pack, available for download. This project contains tools and templates to help you plan and track your game jam journey. It is still in development, but you can download the current version, and check back or follow me for updates.
You can get the pack here: https://cloudyheavengames.itch.io/game-jam-planning-resource-pack
Also, you can read more about the practice game jam series here: http://cloudyheavengames.com/practice-game-development-entering-game-jams/
Keep an eye on this site or follow me on Itch.io to be informed about the latest jams: https://cloudyheavengames.itch.io/