Open-source alternatives to Usdmanager

You can use the node view to preview the usd file and simply edit the usd file, such as overriding prim, switching variants, adding references or payloads, and modifying attributes.

Activision USD Shell Extension

usdtweak is a free and open source editor for Pixar's USD format. usdtweak can already be used for small and simple tasks like cleaning assets, creating and editing layers, inspecting and fixing usd stages. It works on windows, macos and linux.

TinkerUsd is an experimental project written in C++ for R&D purposes. This project is free and very much work in progress.

master : USD 19.07 - Should be compatible with the post-19.07 USD dev branch up to and including b6ccb4e5 - dev : USD 19.11+

A usdview plugin for inspecting UsdShade networks.