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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.
More seriously, not really. Well maybe you can try Birdfont but usually FontForge is regarded as the most complete free editor. Birdfont looks more simple so it might work for you, I don’t know much about it.
NOTE:
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Hence, a higher number means a more popular project.