Ren Ventura

This plugin adds a button to the top of <code>wp-admin/plugins.php</code>. When clicked, every plugin (except for this one) will be deactivated. However, all active plugins are remembered.
After the plugins are deactivated, a button will appear to reactivate them. This will reactivate only the plugins that were active before – plugins that were inactive will not be enabled.
This is helpful for users who need to troubleshoot plugin conflicts by deactivating plugins in bulk. Without this plugin, you’d have to reactivate plugins based on memory. If there are a lot of plugins running on the site, with numerous plugins that are disabled, this can be difficult to do without first creating a list of what was active and inactive.
With the Plugins Deactivator plugin, you can easily disable all plugins at once. With one more click, you can restore your plugins to where they were before.

Plugins Deactivator

Disables all WordPress plugins with one click. Remembers which plugins were active so they can also be re-activated with one click.

Andrew Skochelias

Pavlo Kotula

WordPress changelog – logs any uploads, updates, installations/uninstallations, activations/deactivations of themes, plugins and WordPress core. 
It could be helpful to easily find out the moment when something went wrong with your site and quickly fix the issue.
The plugin logs such actions: 
* Theme installation 
* Theme update 
* Theme activation 
* Theme deactivation 
* Theme removal 
* Plugin installation 
* Plugin update 
* Plugin activation 
* Plugin deactivation 
* Plugin removal 
* Translation update 
* WordPress update 
* WordPress reinstall

WordPress Changelog

It is a very handy plugin in a case when there a lot of people are working on the project. So you can track when and what was updated or installed. And with help of this plugin, you can quickly find out what caused any issues.

Useful plugin

WordPress changelog - logs any uploads, updates, installations/uninstallations, activations/deactivations of themes, plugins and WordPress core.

Plugins Deactivator vs WordPress Changelog