I want to get into speedrunning but on a tight budget. What are some good free games to speed run on pc.

While there are some free PC games on Steam, itch.io and the such, If you want to go free you can always search for web games. Almost 1000 games in wide variety of genres and lengths.

https://www.speedrun.com/games#platform=Web&unofficial=on

(Also post should probably move to "speedrunning")