Interesting, is there a alternative that is open source for OSNIT?
The main selling point of Maltego is the large amount of plugins and data sources that you can integrate with it.
Other shops will have their own bespoke versions of a Maltego-like tool, but yeah, nothing in the Open Source. MISP probably comes closes to having some of the features.
"Aleph: A suite of data analysis tools for investigators (alephdata.org)"