AMG Nascar Fantasy League

Cost: Free
Website: https://fantasygames.nascar.com/live/league/atlanta-motorsports-group
Password: See the pinned message on Discord

Search for the "Atlanta Motorsports Group" league from the League tab of the website.

This is the free fantasy sports app offered by Nascar. The general idea of how it works is you pick a roster of 5 drivers per race plus 1 "garage" pick which can be swapped in at any time before the final stage of the race. You may only pick each driver up to 10 times during the first 26 races of the season and up to 5 times during the final 10 races of the season. For a full explanation, go here.