These are the plugins you want to add to your Mautic. For each plugin, go to releases and find the latest one for your Mautic version
(e.g. Plugin version 7.x for Mautic 7, Plugin version 6.x for Mautic 6, Plugin version <6 for Mautic 5.)
https://github.com/Leuchtfeuer/mautic-CompanySegments-bundle
https://github.com/Leuchtfeuer/mautic-CompanyTags-bundle
https://github.com/Leuchtfeuer/mautic-CompanyPoints-bundle
https://github.com/Leuchtfeuer/mautic-CompanyTimeline-bundle
https://github.com/Leuchtfeuer/mautic-CompanyListWidget-bundle
Details on the installation can be found in the plugin's readme files.
If you install through composer, you will also find the plugins within https://packagist.org/packages/leuchtfeuer/)
This will turn the menu item “Companies” into a number of sub-menu items with all the good things that you already know from contacts!