PAL Amiga

For the purposes of collecting, i think Amiga can be considered region-free.

Games were never officially locked as on consoles but NTSC and PAL machines were produced because it used the TV standard and most of the games worked on both but some games had glitches or did not work. But that was back in the day. Today, users use WHDLoad to load patched games from SD Card and they work everywhere and collectors don’t care since they don’t use floppies to play games, only boxes and other material included to collect.

I think this is not worth the effort (ie the effort should be put into more voted features) but this is just my opinion and i am happy to be outvoted.