LibreX - Framework and javascript free privacy respecting meta search engine

DataWalk - DataWalk is a software platform to connect numerous large data sets, both external and internal, into a single repository for fast visual analysis.

SearXNG - SearXNG is a free internet metasearch engine which aggregates results from various search services and databases. Users are neither tracked nor profiled.

Lampyre - Lampyre - an efficient data analysis and OSINT multi-tool for everyone.

Sherlock - Sherlock provides insights on user engagement for product makers.

Maltego - Maltego is an open source intelligence and forensics application.