My Plugin Manager
My Plugin Manager isn’t actually a WordPress plugin, but a drop-in script for WordPress theme and plugin developers. At the time I created this script, the only way to really onboard your customers to get them to install plugins compatible with your product was to use the TGM Plugin Activation Script.
Because the TGM Plugin Activation script grew into something extremely bloated to accommodate many different folks and would usually contain unfixed bugs, I decided to make a smoother, more light-weight alternative from scratch.
Although the primary motivation to create it was to serve my own products, I also decided to set it up so that it could be shared with other developers, as well. I even created the website mypluginmanager.com that contains a system for developers to put in the information of their WordPress theme or plugin and get a custom version of the script generated for them.