-
heritrix3
Heritrix is the Internet Archive's open-source, extensible, web-scale, archival-quality web crawler project.
-
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 go all the way and use the same tools as the Internet Archive: https://github.com/internetarchive/heritrix3
Actually, the IA uses Brozzler (https://github.com/internetarchive/brozzler) now if I remember correctly.
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.