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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.
TastyIgniter might be a good start. You can download it for free and install it into your own server or have the developer manage it for you.
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.