TL;DR
Maigret is an open-source tool that takes a username, finds accounts on 3000+ websites, and collects public profile information to generate a comprehensive report.
Key features
Extensive site support: Search for usernames on 3000+ sites (500 by default, full search with -a option)
Information extraction: Automatically collect public info like profile pictures, name, location, bio
AI analysis: Provides a demo for person profiling based on collected data
Python library: Can be embedded in other Python projects
Web interface: Easy to use via web UI
When to use it
When tracking online activity of a specific username during OSINT investigations
When identifying an attacker's identity during security audits or incident response
When checking personal information exposure or for social engineering defense