I use Seasons of Feast and Seasons of Famine. For about 3 months I will gleefully add new tools to my kit, trying them out, seeing what sticks and what doesn't. Then for 3 months I'll pare down to only what I actually find value in using from that collection. Rinse and repeat.

Shell Bling Ubuntu was partly formed out of running through this a few times. Every tool that is included in the 3 scripts is a tool I found persisting beyond a full Season of Famine, and therefore it gets my recommendation. https://github.com/hiAndrewQuinn/shell-bling-ubuntu