- COCO Annotator
- Web-based image segmentation tool for object detection, localization and keypoints
- Computer Vision Annotation Tool (CVAT)
- OpenCV's web-based annotation tool for both VIDEOS and images for computer algorithms.
- Doccano
- Open source text annotation tools for humans, providing functionality for sentiment analysis, named entity recognition, and machine translation.
- ImageTagger
- Image labelling tool with support for collaboration, supporting bounding box, polygon, line, point labelling, label export, etc.
- ImgLab
- Image annotation tool for bounding boxes with auto-suggestion and extensibility for plugins.
- Label Studio
- Multi-domain data labeling and annotation tool with standardized output format
- Labelimg
- Open source graphical image annotation tool writen in Python using QT for graphical interface focusing primarily on bounding boxes.
- OpenLabeling
- Open source tool for labelling images with support for labels, edges, as well as image resizing and zooming in.
- PixelAnnotationTool
- Image annotation tool with ability to "colour" on the images to select labels for segmentation. Process is semi-automated with the watershed marked algorithm of OpenCV
- Semantic Segmentation Editor
- Hitachi's Open source tool for labelling camera and LIDAR data.
- Superintendent
- superintendent provides an ipywidget-based interactive labelling tool for your data.
- VGG Image Annotator (VIA) - A simple and standalone manual annotation software for image, audio and video. VIA runs in a web browser and does not require any installation or setup.
- Visual Object Tagging Tool (VOTT)
- Microsoft's Open Source electron app for labelling videos and images for object detection models (with active learning functionality)
