Scott Reilly

This plugin adds “Toggle” as a bulk action for the plugins listing to toggle the activation state for selected plugins.
From the admin listing of plugins you can now select multiple plugins and choose “Toggle” from the “Bulk actions” dropdown. When applied, all selected plugins that are currently activated will become deactivated, and all selected plugins that are currently deactivated will become activated.
Links: <a href="https://coffee2code.com/wp-plugins/bulk-plugin-toggle/" rel="nofollow ugc">Plugin Homepage</a> | <a href="https://wordpress.org/plugins/bulk-plugin-toggle/" rel="ugc">Plugin Directory Page</a> | <a href="https://github.com/coffee2code/bulk-plugin-toggle/" rel="nofollow ugc">GitHub</a> | <a href="https://coffee2code.com/" rel="nofollow ugc">Author Homepage</a>

Bulk Plugin Toggle

Adds "Toggle" as a bulk action for the plugins listing to toggle the activation state for selected plugins.

Otto Kekäläinen

Viljami Kuosmanen

Onni Hakala

Currently WordPress doesn’t allow you to add custom bulk actions. See codex. Adding them is super easy with this plugin.
This is based on solution found here: http://www.skyverge.com/blog/add-custom-bulk-action/ 
This plugin just makes it more easier to use.
Plugin adds a class named Seravo_Custom_Bulk_Action which you can use to easily define custom bulk actions. 
See documentation and examples here: https://github.com/Seravo/wp-custom-bulk-actions/

Custom Bulk Actions

Currently Wordpress doesn't allow you to add custom bulk actions. Adding them is super easy with this plugin.

Bulk Plugin Toggle vs Custom Bulk Actions