An excellent sourcemod of Team Fortress 2 based on arena shooters, with super smooth feeling movement. Bhop at high speeds, grab cool weapons, snatch super groovy powerups... all through uniquely made maps in the TF2 artstyle. It's a little difficult to get a full server sometimes since the mod isn't as popular as TF2, but luckily the Open Fortress Discord has a channel with a bot that shows currently active servers, so you don't have to open the game to find out when servers are active. Cool stuff!