SIREN.io - Siren is an investigative intelligence platform.
Maltego - Maltego is an open source intelligence and forensics application.
Lampyre - Lampyre - an efficient data analysis and OSINT multi-tool for everyone.
sn0int - sn0int is a semi-automatic OSINT framework and package manager
Sentinel Visualizer - Link Analysis, Data Visualization, Geospatial Mapping, and Social Network Analysis (SNA) with Sentinel Visualizer
LinkScope Client - Repository for the LinkScope Client software.