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WooCommerce
A customizable, open-source ecommerce platform built on WordPress. Build any commerce solution you can imagine.
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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.
While every project always has its own requirements and needs, I tend to always encourage people to use WooCommerce. It's just so common these days that you have the ability to do just about anything you want with it. I rarely see a reason to use anything else.
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.