This is an X.509 certificate crawler designed by C which as following advantage that other crawlers may NOT have:
This crawler collects the X.509 certificates, but also can be used to crawl anything with a little modification!
This crawler can be run on any linux-based server.
This crawler is optimized, and can be ran on a single board computer! (Such as Raspberry Pi 1, 2, 3, Zero)
This crawler can be locally compiled, distributed using any method, and ran on remote server without any environment configuration, because it is written by C!
This crawler keep the state of collection, can recover crawling right at where it stops, can even handle suddenly power-outage.
TO BE CONTINUED!