I nominate Molex SL. 2.54 mm for easy fit on breadboards and such (EH is 2.5 mm), can fit multiple connectors side by side (just like "dupont" connectors), they

I nominate Molex SL. 2.54 mm for easy fit on breadboards and such (EH is 2.5 mm), can fit multiple connectors side by side (just like "dupont" connectors), they have latches (molex KK, for example, has no latch) and many variants: wire to wire, wire to board, panel mount, shrouded and unshrouded. And they are pretty cheap and available (from digikey and co).