The Arborator software is aimed at collaboratively annotating dependency corpora.
Click on the Help link on top to understand the features.
The quick page allows to easily
- visualize and edit a CoNLL file of dependency annotation
- create a dependency graph for a yet unannotated sentence
- export in graphical or CoNLL formats.
A report on Arborator's options for class-sourcing dependency annotation is here: https://scholar.google.fr/citations?view_op=view_citation&hl=en&citation_for_view=jCFpJfEAAAAJ:k_IJM867U9cC
Please also cite this article if you use Arborator for research.
Check out the instructions on the Wiki page.