Can you help to identify these frames, bikes or parts?

^^^
Cranks are Croc
Delta brakes are Crec
Headset is difficult to say as chorus croc and crec had the same design
seatpost crec or mid 90s chorus
Brifters probably chorus
Hubs probably croc or chorus

Nice batavus pro tho, columbus slx?
I did have a similair one but with wrapover stays - like gazelle CM - too bad it's gone..
also it looks like that isn't the original fork, but i could be wrong.

I can't see the centre clips on the hubs that C Rec and CDA had?

Agreed on the fork - It doesn't look original.