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IndieGo
Tiny go api that serves your websites comments. The comments are stored in a lightweight sqlite database.
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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.
Something like a spam filter or rate limiting could be implemented by just implementing the Handler interface.
Cool. You should probably look at https://github.com/vkuznecovas/mouthful to compare their approach to yours. See if they have any good ideas worth poaching.
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.