Interesting Applications
This is a list of interesting utilities that can make your VR experience better
Tracking related
Space Calibrator
OSC Smooth
Standable
VRCFaceTracking
PC VR Utilities
OVR Advanced Settings (Windows, Linux)
An open source tool that adds many settings to SteamVR for controlling various aspects. Also allows you to setup smooth turning and playspace movement for SteamVR. This software is essentially a must have for PCVR SteamVR users.
You can get this software conveniently from Steam (albeit for money), or directly download it from Github for free (but install and update it manually).
VRChat Specific
VRCX (Windows, Linux)
Open source desktop tool for seeing what your friends are doing without needing to launch VRChat itself. Also comes with plenty of tools for logging, account management, and crash recovery.
You can get this software from Github.