Fresh off the GitHub repository – Leviathan, an open source, wide-range security audit toolkit that helps you with service discovery, brute force, SQL injection detection and running custom exploit. One of the guys behind this project is Utku Sen. If you remember he was the one who wrote open source ransomware – EDA2 and Hidden Tear.
This year at RSA, I remember meeting with a vendor who dealt with database security by encrypting the database. I forget the name, but found a open source project – Acra, which I think is a promising product if designed & developed right.