This Angular component library is perfect for tasks like visualizing named entity recognition, part of speech tagging, or annotating text datasets. It allows for interactively highlighting and annotating parts of text.

GATE plugin to annotate documents with TIMEX3 tags using the SUTime library.

Automate approach to label images for object detection using TensorFlow

Contains the recent xournal sources and additional patches in the 'patched' branch

Java SDK to work with GroupDocs.Annotation REST API. Annotate documents & images in the Cloud with Java.