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auter
Automatic updates for RHEL, Debian, and their derivatives, with the ability to run pre/post hooks & reboot afterwards.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I'm quite fond of Auter. I've been using it to automate patching of about 250 servers (RHEL, but Auter supports Ubuntu as well). It's quite flexible and easily extendable via its hooks. You can use Ansible or similar to deploy the config and cronjob to all your hosts, and then just sit back and watch it do its thing. No GUI, though.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.