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libvmod-throttle
Varnish: Reject or delay requests after given tresholds are reached. (Think API rate limit, or per-ip MISS rate limit)
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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.
You can use Varnish Throttle to slow down the incoming traffic in case you suspect some malicious behavior by using IP addresses, specific headers or URL patterns (e.g., particular parameters or API keys).
There's no native support for SSL/TLS, but you can use Hitch to terminate TLS/SSL connections and forwards the unencrypted traffic.
The community has exciting and free shares, such as VSF, but it's still a work in progress, and I doubt they have the necessary time and resources to support all versions. Anyway, it can be a great inspiration to set security rules in your Varnish.