Re: Alternatives to these WP plugins
Kunal17-
Remember, BuddyPress is just a WPMU plugin. Granted, a big, fancy, and powerful WPMU plugin!
The best practice is to contact each plugin developer and ask if there are any issues using their plugin with BuddyPress. Also, if their plugin has not yet been updated to work with WPMU 2.7.1, then you will want to request that it be updated as soon as possible. Using plugins that are not yet supported on, or will not be updated to, the current version of WPMU is not advisable.