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redis-cache
A persistent object cache backend for WordPress powered by Redis. Supports Predis, PhpRedis, Relay, replication, sentinels, clustering and WP-CLI.
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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.
Ah yes, good catch. For caching I use Redis (which is installed/setup on the server, and connected via the Redis Object Cache plugin). I tend to also implement a good amount of caching in the theme itself using WP's built in caching functions, as well as utilizing Cloudflare. All assets (SCSS, JS etc...) are compressed/minified before being pushed up to the theme's repo.
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.