The essential plugin for every multisite install! Manage plugin access permissions across your entire multisite network.
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.
Also, if you use the excellent Pro Sites plugin from WPMU DEV you will be able to charge for access to certain plugins!
A free plugin by Aaron Edwards of UglyRobot Web Development.