VRChat does not condone the use of mods, and, if found to be modifying the client, then you will be punished.
That being said, there is no anticheat of any sort (file integrity check, position check, etc.) placed on the client. The only anticheat (if it could be called that) in VRChat is an API limiter, and Photon checks, and the mods listed in this repository, will not trigger any of those. The real only way to get punished on this game is to piss of the aforementioned anticheats, or be reported by a user with video evidence of you using a mod (whether this be you flying or verbally admitting you mod the game).
So just, stay safe, and don't be stupid and run around saying you use mods, and you'll be a-ok.
Also, for my sake, I am not responsible for any bans using my mods may cause.
Detailed instructions and more mods can be found in the VRChat Modding Group Discord.
A basic instance history mod
You can use the custom button on the Launch Pad QM page (highlighted below), or UIX. There is a preference in Mod Settings to toggle between them.
This library is licensed under LGPL v3. This means that you are allowed to reference the library in your code as long as you disclose source and have a license and copyright notice you will be fine. In the case that you would like to modify or include the library in your mod, you must use the same license as well as state any changes.
If you are caught not properly following the license, I will not hesitate to take you repo or Discord account down.
Also note that I have used code licensed under GPL v3, however, I have been granted express permission to license this code under LGPL v3.