Redliner

I've come across a number of collaborative document review tools recently, e.g. see Monday's posting about Hylighter. Today, it's the turn of Redliner, which is described as

"the online word processor that truly simplifies the entire group editing and document approval process. Redliner allows you to instantly bring together a collaborative team, without having to install new software or engage in time-consuming training. Redliner’s accessibility—to anyone, anywhere—and intuitive features make it an overwhelming improvement to tracking changes in Microsoft Word and emailing multiple versions back and forth."

Take a look at the video below for more about Redliner:

Currently free, although monthly priced plans will be available later

Redliner

[Over 90 more document tools and office suites here]