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TastyIgniter
:fire: Powerful, yet easy to use, open-source online ordering, table reservation and management system for restaurants
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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.
You could checkout tastyigniter, https://tastyigniter.com It is PHP (laravel) based open source app. It is not headless but definitely worth checking out. Since it is open source and laravel based extending APIs should also be fairly easy.
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.