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DepAnnotator is an annotation tool designed to annotate dependency graphs such as predicate-argument structures. It can also be used to annotate dependency trees. It is based on the Qt Framework to be fully cross-platform.
OGRE stands for Optimized Graph Rewriting Engine. It is a graph rewriting system designed for rewriting syntactic trees into semantic graphs.
TreebankAnalytics is a collection of NLP tools that helps you compute valuable information on graphbanks (deep syntatic treebanks, PropBank, etc.), evaluate system outputs against references or convert one format to another.