Holehe

Holehe takes a single email address and asks more than 120 sites whether an account exists on it, using each site's forgotten-password flow instead of trying to log in. Twitter, Instagram, Imgur and eBay are among the services covered, and results come back as a list of hits along with whatever the reset screen leaked on the way. It runs from the command line as holehe test@gmail.com, and the same modules can be pulled straight into Python code through trio and httpx. The project is GPL-3.0 and has collected roughly 12,500 stars. Installation is one pip3 install holehe, with Docker and source builds documented as well.