z.lua is a new tool that helps navigate your filesystem faster from the command line, tracking your most used directories based on "frecency".
At first, the tool learns your most frequently used directories, and then uses a "frecency" (based on how recently and how frequently a directory was accessed) based algorithm to rank directories, making it easy to navigate to certain directories by only typing a few letters of their path. Don't expect z.lua to work right away, it will take a bit of time for it to create a database of frequent and recent directories.
While there are other similar tool out there, the developer claims z.lua is a lot faster. For example, z.lua is supposed to be 10 times faster than fasd and autojump, and 3 times faster than z.sh.
