FTA

代码说明：

  事故树分析软件，虽然不算是源码，但是它的功能还是很好的，而且网络上也比较流传的。对从事安全相关工作的人事有用。(Fault tree analysis software, although not a source, but its function is still very good, but the network also circulating. Engaged in security-related personnel useful work.)