If anyone is looking for user-friendly command auto-completion in the terminal, fig is a very human and user-friendly tool for that.
Just recently, Linux support has been in the works and there is now an alpha trial phase for people interested in testing the app and thereby contributing to the project, by finding bugs, issues and reporting them to the maintainers.
If you want to be part of the alpha testing phase, consider providing some information in the following form and you will probably get the chance to be an alpha tester for this nice tool.