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The biggest threat to security is weak passwords. If you think you have good strong passwords, there are some tools that you can test them with. Hydra is a free brute force password cracking tool which can attack single or multiple user accounts. Primarily a command-line tool, the password cracker also has a graphical user interface that can be used to create complex attacking patterns. Hydra can interact with a huge range of services including HTTP, IMAP, LDAP, POP3, RDP, SMB, VNC and more.
Another popular password cracker included in Kali is John the Ripper. This is used primarily for exposing weak Unix passwords. Like Hydra, John the Ripper is a command-line tool but also has a graphical interface (called Johnny) which does a nice job of exposing its various command line options.