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MailTrackerBlocker
Email tracker, read receipt and spy pixel blocker plugin for macOS Mail (10.11-13.x)
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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 use Mail on Mac check out this article from Daring Fireball on a tracker blocking plugin. It’s called MailTrackerBlocker and it’s open sourced on 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.