Asaf Zamir – Chief Technology Officer & AI/Cloud Consultant. Founder of CloudExpat, AZdev. Author of Coder to CTO.

If you're developing Themes/Plugins and want to update them on various websites you own/manage, it can be quite a hassle.
One way would be to use WP Remote and bulk update all your plugins and themes.
This method assumes that all your plugins are on Wordpress.org, where most Plugins/Themes are.
The problem with that is that it's not always the case, you wouldn't want to submit your plugin to Wordpress.org if:

Now that the holidays are over, it's time to build new things.
If we want to develop our visual creativity, and create a new Theme for WordPress, there are a few tasks that one has to do on every theme.
There's adding functions.php, customized header and footer files,
perhaps supporting rtl languages (with CSS tweaks), adding SASS support, etc.
Luckily there's a service to help you out with that!