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pywb

Top pick

High-performance Python web archive replay stack (WARC) used by Webrecorder and many institutions for Wayback-style access.

web-archivingwarcwaybackcrawlreplay

Archiving & digital preservation

Heritrix

Also strong

Extensible, web-scale, archival-quality crawler produced by the Internet Archive for capturing sites into WARC files.

web-archivingcrawlerwarcharvesting