LibreX - Framework and javascript free privacy respecting meta search engine
Lampyre - Lampyre - an efficient data analysis and OSINT multi-tool for everyone.
Searx - Open source metasearch engine
Sentinel Visualizer - Link Analysis, Data Visualization, Geospatial Mapping, and Social Network Analysis (SNA) with Sentinel Visualizer
SearXNG - SearXNG is a free internet metasearch engine which aggregates results from various search services and databases. Users are neither tracked nor profiled.
SIREN.io - Siren is an investigative intelligence platform.