SpiderFoot on your own server
SpiderFoot is a reconnaissance tool that automatically queries over 100 public data sources (OSINT) to gather intelligence on IP addresses, domain names, e-mail addresses, names and more. You simply specify the target you want to investigate, pick which modules to enable and then SpiderFoot will collect data to build up an understanding of all the entities and how they relate to each other."
If you - like me - sometimes want to run this yourself, I added yet another bash script to do just that.
It's available on Github: https://github.com/martinboller/spiderfoot-build