Indeed, it would have been better if the author had mentioned Collabtive (http://collabtive.o-dyn.de/ http://collabtive.o-dyn.de/), or even better: did a short

Indeed, it would have been better if the author had mentioned Collabtive (http://collabtive.o-dyn.de/ http://collabtive.o-dyn.de/), or even better: did a short comparison.