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CVAT is a leading data annotation platform for image, video, audio, and 3D datasets. It offers open-source, cloud, and enterprise products, as well as labeling services, with AI-assisted labeling, quality assurance, team collaboration, analytics, and developer APIs.
Label Studio is a multi-type data labeling and annotation tool with standardized output format
Cross-platform editor for singing voice labels: phonemes, notes, pitch and UTAU oto. Works with DiffSinger datasets, supports automatic labeling. Windows, macOS, Linux, Android, iOS.