This plugin creates a private instance of Adminer in WinterCMS backend.
Adminer is a database management tool (written in PHP).
Currently supports MySQL, PostgreSQL, SQLite, MS SQL (and many more). It's a fast and light-weight alternative to phpMyAdmin (more info on this).
In your WinterCMS backend, go to Updates > Install plugins and search for "gviabcua.adminer" or install from WinterCMS Marketplace.
Click on the toolbar button and manually insert your database credentials.
You need to be logged on WinterCMS Backend to access Adminer.
Also, you can give permissions to your backend users but remember, they are going to have access to the whole WinterCMS database (or databases, depends on your db user privileges).
The plugin is fully functional but i'm open to suggestions/ideas.