by Senff - a11n on WordPress.org
Saves a list of currently active plugins so that you can do some testing, and then when you're done, go back to how things were before.

Main screen
Ever want to do some conflict testing by activating and deactivating a bunch of plugins, and then when you’re done, go back to how things were before without having to make a full site backup?
With Plugin Status Snapshotter, you can make a Snaphot of which plugins are currently active in your site, then activate and deactivate plugins for testing as much as you like, and then restore the Snapshot again to go back to how things were before.
Snapshots will only keep track which plugins were ACTIVE or not. It will NOT back up/restore any plugin’s settings, or install/delete plugins.