shawfactor

Allows Buddypress group admins to send email and private messages to all group members from the group admin/manage section.
This plugin sends each message (PM or email) individually to each group member. And supports merge tags to personalise the message for each recipient.
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LH Buddypress Email or Message Group Members

Allows Buddypress group Admins to send email and/or a private message to all group members .

TIEro

A simple plugin to find files which are stored in the WP uploads folder (and sub-folders) but which have no corresponding entry in the Media Library.
The plugin creates a new unattached media record for each file, plus metadata where appropriate. You can then delete leftover files through the normal WordPress Media Library UI.

TIEmediahelper Media Library Tools

Find leftover files stored in the WP uploads directory tree which are missing from the Media Library.

LH Buddypress Email or Message Group Members vs TIEmediahelper Media Library Tools