Jetpack - Jetpack offers SEO and security plugins for Wordpress.
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
WP User Manager - The most customizable profiles, community builder and membership WordPress plugin
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
UpStream Plugin - UpStream Plugin is a free-to-use project management plugin that allows you to manage various types of projects right from your WordPress site.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.