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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.
There are a lot of free online platforms such as woocommerce, shopify etc, that enable you to create an online store on their platform for free without having to build one from scratch.
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.