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dc-mailchimp-signup
MailChimp integration for your WordPress website. Add widget for users to signup for your newsletter; automatically send newly registered user to a custom MailChimp audience; integrates with WooCommerce & Ultimate Member plugins
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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.
Here's the link to the plugin on GitHub. In case you're not familiar, here's a quick run down on how to install a plugin from GitHub.
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.