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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.
I use cl-cron and it works just fine. The original Bitbutcket repository isn't available anymore, but there's a Github mirror (which wasn't updated for Quicklisp): https://github.com/ciel-lang/cl-cron
There's also Clerk: https://github.com/tsikov/clerk (didn't try)
There is also https://github.com/endsec/scheduler aiming at somewhat similar functionality.
NOTE:
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Hence, a higher number means a more popular project.