SQLSentinel is an opensource tool that automates the process of finding the sql injection on a website. SQLSentinel includes a spider web and sql errors finder. You give in input a site and SQLSentinel crawls and try to exploit parameters validation error for you. When job is finished, it can generate a pdf report which contains the url vuln found and the url crawled.
Please remember that SQLSentinel is not an exploiting tool. It can only finds url Vulnerabilities
SQLSentinel official site:
Love that its free