Onniforums is an underground darkweb cybersecurity forum with an active marketplace and database leaks sections, we focus on privacy, and cryptography topics, CTF challenges, and exploits. We have a very skilled community, yet we welcome everyone regardless of their skill-level.
http://onnii6niq53gv3rvjpi7z5axkasurk2x5w5lwliep4qyeb2azagxn4qd.onion