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bastille
Bastille is an open-source system for automating deployment and management of containerized applications on FreeBSD.
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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.
Obviously, not as popular - but having used both - I much prefer jails myself. It seems that they can run on opnsense too: https://eerielinux.wordpress.com/2017/07/15/building-a-bsd-home-router-pt-8-zfs-and-jails/ - though instead of iocage referenced here - I'd suggest using: https://bastillebsd.org/
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.