If you spend a lot of time at the command prompt then a few tools can really help your productivity, here are some which I like to use:

1. tilix is a terminal emulator which is very easy to setup and customise.
2. bash-powerline adds some git information to the command line prompt.
3. exa is a replacement for ls (which I alias to la) which looks a lot better
4. fzf is a replacement for ctrl + r which reverse searches your command line history (and much more!).
5. ag is a super fast searching tool, which I use all the time instead of recursive grep.
6. htop is a much better looking version of top.
7. nvtop is like htop but for monitoring nvidia GPUs