How can I aggregate information from about 30 Drupal sites in one place? I have about 30 websites on Drupal. I'm looking for module or service where i can aggregate information from all websites in one place. I need information about number of nodes, comments, users, Drupal core and modules versions. Something like acquia insight but for more sites and cheaper :)
The Similar Module Review's Administration module wiki lists several options.

The following show some usage statistics, as well as Drupal core and module updates:


Droptor (Requires paid service for more than 1 site.)
Drupal Remote Dashboard
Network Manager (Drupal 7 version doesn't exist yet.)
Sentry Server (Drupal 7 version doesn't exist yet.)