SIREN.io - Siren is an investigative intelligence platform.
TLOxp - TLOXP
Lampyre - Lampyre - an efficient data analysis and OSINT multi-tool for everyone.
Sentinel Visualizer - Link Analysis, Data Visualization, Geospatial Mapping, and Social Network Analysis (SNA) with Sentinel Visualizer
Netglub - Netglub, the really open source information gathering solution.
SpiderFoot - Open source intelligence (OSINT) automation tool.