Here is a quick collection of some interesting shell tools I have encountered and been using lately.

fd

https://github.com/sharkdp/fd

fasd

https://github.com/clvv/fasd

dry

https://github.com/moncho/dry

axel

https://github.com/axel-download-accelerator/axel

bashtop

https://github.com/aristocratos/bashtop