Classroom Salon is a document and video annotation system. All your course documents and videos can be annotated by students using salon's annotation tools. They can comment on specific words, sentences and paragraphs and also comment on video frames. Salon aggregates all these annotations to provide amazing insights into student thinking.
This free tool allows you to create hypermedia glosses including text, pictures, videos, audio. It is available in many languages. A.k.a. FLAn: foreign language annotator.
Created by Dr. Thom Thibault, who is very active in CALICO
backchan.nl is tool for involving audiences in presentations by letting them suggest questions and vote on each other's questions. backchan.nl is intended for conference or event organizers who want a new way to solicit questions from the audience and make better use of question and answer time.
Text Message (SMS), Twitter, and web Polls and Voting, Audience Response System
Now includes presenter tools so that you can create polls on the fly (during a presentation).
Can embed live poll results in a PowerPoint or Keynote presentation.
Limitations: Free version allows up to 40 responses.
Google's social network. The "hangout" feature lets you do videochat, including some virtual classroom tools.
Limitations: Hangouts are limited to 10 participants.
a free, open source toolkit for processing natural language text, based on machine learning. It includes common natural language processing functions such as tokenization, sentence segmentation, part-of-speech tagging, named entity extraction, chunking, parsing, and coreference resolution.
Limitations: can be difficult to use unless you have programming background