Free offline custom dataset labelling tool

Hi, are there any free toolsets for labelling custom computer vision datasets that could work offline without an internet connection and can be consumed by TAO framework? Something that can export natively to KITTI format for objected detection. Most of the data labelling toolsets outlined in the blog link below is online and/or paid services. I am looking for a tool that is free and is also able to work offline

Integrating with Data Generation and Labeling Tools for Accurate AI Training | NVIDIA Technical Blog

You can search on the web.
For example,
In Facial Landmarks Estimation | NVIDIA NGC
The Sloth and Label-Studio tools have been utilized for labeling.

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