Using Games and Utilities with RUMP
Anything that supports the Intiface/Buttplug.io protocol and supports rumble/vibration hardware will be able to connect to RUMP and send data to your VTuber avatar. This includes games, game mods, video players, tools, and utilities.
Note that these tools are made by community developers, and I haven't personally tried or tested with all of them, so I'm not able to provide support if you're running into issues with individual mods or tools.
Game Mods and Utilities
A list of known SFW Intiface-related mods and tools can can be found here at the Awesome Intiface SFW List.
Game Haptics Router
In addition to mods made for specific games, there's also the Intiface Game Haptics Router, a tool that intercepts rumble signals being sent to your game controller and sends them to Intiface as vibration signals. In other words, it can be used with RUMP to make your avatar respond to game rumble, even if you don't have a mod specifically for that game.
It doesn't necessarily work on everything (in particular, it typically can't connect to games with anti-cheat functionality), but it still offers the possibility of connecting to many games that don't have specific mods for them. The Game Haptics Router compatibility list lists games that have been tested with it in the past, as well as tips that might help with getting specific games working.