Corpora: tools for collaborative annotation

[Steven Bird]

I'm wondering what software exists for collaborative annotation.  By
collaborative annotation I mean the process by which two or more people who
may be geographically separated simultaneously assign linguistic tags to
the same raw material (text, audio, video, ...).  Each annotator is able to
view the work of the others, taking it into consideration while annotating.

For instance, a multilayer annotation containing some combination of prosodic,
syntactic and discourse level markup may depend on critical judgements made
by geographically separated specialists.  The decisions made by any one of
them may benefit from seeing the work of the others.

(Non-examples are projects having a pipeline structure, where multiple
layers are created one at a time, and where layer n annotation doesn't
begin until layer n-1 is complete.  Of course these are also collaborative
to an extent, but the collaboration is not simultaneous and bidirectional.)

Please let me know of any projects or tools that may be relevant.

Many thanks,
Steven Bird

--
Steven.Bird at ldc.upenn.edu  http://www.ldc.upenn.edu/sb
Assoc Director, LDC; Adj Assoc Prof, CIS & Linguistics
Linguistic Data Consortium, University of Pennsylvania
3615 Market St, Suite 200, Philadelphia, PA 19104-2608