gregfI made a Splunk app for External Attack Surface Management (EASM). It's not going to compete with the big boys, but it's powerful, extensible, free and open-source.
It wraps an API around Project Discovery's recon tools, with
Splunk running discovery jobs and dashboarding results.
- https://splunkbase.splunk.com/app/7010 (SplunkBase)
- https://github.com/gf13579/splunk_easm_worker (GitHub - Worker)
- https://github.com/gf13579/splunk_app_for_easm (GitHub - App)