Aaron Edwards

Plugin management for WordPress Multisite that supports the native plugins page and the WPMU DEV Pro Sites plugin! Used on thousands of multisite installs across the web. 
Previously known as WPMU Plugin Manager, it uses a backend options page to adjust plugin permissions for all the sites in your network.
<ul>
<li>Select what plugins sites have access to</li>
<li>Choose plugins to Auto-Activate for all new blogs</li>
<li>Mass activate/deactivate a plugin on all sites in your network (Very Handy!)</li>
<li>Assign special plugin access permissions for specific sites in your network</li>
<li>And as Super Admin, you can override all these to activate specific plugins on the sites you choose!</li>
<li>Removes the plugin meta row links (Version, Author, Plugin) and any update messages for blog admins</li>
</ul>
Also, if you use the excellent <a href="https://premium.wpmudev.org/project/pro-sites/" rel="nofollow ugc">Pro Sites plugin from WPMU DEV</a> you will be able to charge for access to certain plugins!
A free plugin by Aaron Edwards of <a href="http://uglyrobot.com/" rel="nofollow ugc">UglyRobot Web Development</a>.
<a href="https://github.com/uglyrobot/multisite-plugin-manager" rel="nofollow ugc">Contribute on GitHub</a>

Multisite Plugin Manager

I haven't had any issues with the functionality of the plugin, but the interface for granting plugin access to individual sites really needs improvement. Right now it's shoved under the "Settings" tab when editing an individual site, but when a site has a lot of options, this can make the page HUGE. The list of plugins should really be in its own "Plugins" tab, much like "Themes".

Plugin works well but interface needs improvement

This plugin helped me a lot when I had to reactivate one plugin on over 100 sites because accidentally I have activated it for the whole Network previously.

Good job!
Air.

Nice help for multisite

The essential plugin for every multisite install! Manage plugin access permissions across your entire multisite network.

Marcus (aka @msykes)

Pixelite

Marcus

This is a very simple and lightweight plugin that anonymizes default avatars and prevents the user’s gravatar being automatically obtained from gravatar.com based on their registered email. This would be useful for sites where users require an extra layer of privacy, or if you just want to prevent potentially silly or embarrasing avatar accidents.
If you’re using Identicons or any other generated default avatar, the user should keep a consistent avatar unless they change their registered email.
You can also disable Gravatar completely and choose a default image to display.
This plugin is also compatible with other avatar customization plugins such as <a href="https://wordpress.org/plugins/avatar-manager/" rel="ugc">Avatar Manager</a>, <a href="https://wordpress.org/plugins/buddypress/" rel="ugc">BuddyPress</a> or <a href="https://wordpress.org/plugins/add-new-default-avatar/" rel="ugc">Add New Default Avatar</a>, since this plugin specifically prevents the gravatar of a specific user email being used and reverts to the default or user-defined avatar.
Important 3.0 Update – BuddyPress users should visit the Settings > Discussion page on your dashboard and choose one of the Disable Gravatar options to restore previous behavior.
If you have any issues or suggestions, please visit our <a href="https://wordpress.org/support/plugin/disable-user-gravatar" rel="ugc">support forums</a>.
If you find this plugin useful and would like to say thanks, please leave us a <a href="https://wordpress.org/support/view/plugin-reviews/disable-user-gravatar?filter=5" rel="ugc">5 star review</a>!

Disable User Gravatar

The plugin is a must-have for each WordPress installation. One can't process the email of the user (personal information) to create a hash and sent it to a remote server without consent of the user.

Must-have

Stops WordPress from grabbing a user avatar using their registrated email from gravatar.com.

Multisite Plugin Manager vs Disable User Gravatar