I have a few interesting collaborative applications I've run across. Not entirely sure if they fit in OG, but food for thought:
Chat - Some of my clients have been using
Spark for years, and now there's
SparkWeb (which I haven't used). Spark has proven to run incredibly bulletproof and straightforward to use, and SparkWeb may be something to consider. I realize there is
another thread about a chat extension, but since that has not been included in the latest release, I'm not sure if it will ever become part of OG. Spark is proven and has a long history, and I'm sure SparkWeb will follow in its footsteps.
Support Chat - similar to but slightly different from the above, support chat is something that would be useful when giving your clients access to OG and having someone available for one-on-one support.
Open Web Messenger is one such app that could create a new revenue stream or offer greater support capabilities for a company that uses OG.
Web Meetings -
Dimdim Open Source edition (GPL). Nuff said.
Whiteboard - I can't seem to find a good open source whiteboard app, but something as simple as
sneffel or as full featured as
Twiddla could be a great collaboration tool if you need more than just text.
cheers