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OpenCart
A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.
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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.
If you don't care about the Framework, I would recommend Opencart https://www.opencart.com/, it uses an internal Microframework, in general it is basically pure PHP with little dependency, with that it is one of the best in performance and ease of customization, being 100% modular.
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.