Alternatives to screw terminals, breadboards for prototypes?
I like screwless terminals:

Wago 2060 series:



Wago 233 series:



These just require a simple push down of a screwdriver to insert or remove cable.

For easy-to-make cable, IDC ribbon connectors are nice, as you don't have to strip the cable, just insert it into the connector and compress gently with a vice.



Alternatively if you don't mind screwing the terminals in once, but then want easy disconnect / reconnect, try pluggable terminal blocks:



These are also available in screwless types.