Team Fortress 2 Classic is an upcoming Source Engine mod based on Valve's Team Fortress 2, it was due to hold an open beta but they've had to scrap it.

Read the full article here: https://www.gamingonlinux.com/2025/10/team-fortress-2-classic-scrap-their-open-beta-and-new-valve-rules-likely-mean-they-have-to-change-the-name/