iqbalthakur,
You're confusing yourself with a cms meaning. content management system vs. community management system. Both serve very different purposes.I would say boonex is a community management system. I honestly don't know why people get sooo hyped over Joomla.
Wordpress is good but not a cms it's blogging software with extensions.
Drupal very upscale fully open source,takes a bit of time to master followed by free and i'll say it again free modules and those that take the time to write see more them as they would say "free beer" wish it was like that here aswell.

Not familiar with e107,

osdate is straight up dating and can hog up your database followed by 2-3 hours just to set it up.

As for ajax yes agreed also jquery is pretty cool if that was implemented.