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PDF Annot is a piece of software that enables you to add audio and text annotation to a PDF. It uses JPedal SimpleViewer and iText library. Annotations are supported by Adobe'sofficial PDF Reader. Report any bug here: krakosia[at]gmail.com
AGTK is a suite of software components for building tools for annotating linguistic signals,
time-series data which documents any kind of linguistic behavior (e.g. audio, video).
The internal data structures are based on annotation graphs.
Replaytool provides an environment for the replay and annotation of multiple media sources, such as video files, text logs, map data etc. See www.cs.nott.ac.uk/~apf for some more screenshots and videos.