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pinewall
A project to create a Linux-based home firewall/gateway/router from scratch. Based on Alpine Linux + nftables.
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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.
If you want an interesting Pi project, I've just found the pinewall project, which combined with a managed switch allows you to use a single NIC as both the LAN and WAN interface for the router.
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.