Not sure if this is a good idea as I'll just end up looking like something of an SI hack (and as being a hack goes, how utterly unsexy is
that?) but, eh. Why not. Using ag's list of countries because it's the longest:
US: DSA, which means voting for the Democrats (as less-than-great as they are) most of the time. Occasional votes for random fringe nutters when appropriate.
UK: Labour
France: Plural Left (if that term is still used) but no loyalty to any party, because I have serious issues with the PS and, obviously, there are a different set of issues with the other Left parties.
Germany: SPD
Italy: I would vote for the PD, but... sigh. In the First Republic Italy would have been pretty much the only place where I'd have supported the Commies.
Spain: PSOE
Catalunya: PSC
Israel: I have a sentimental liking for Labour, despite everything. I'll leave it at that.
South Korea: they're all awful. None of the right-wing parties and not the Democrats either. The smaller leftish parties look a little crazed as well, but probably one of those...
Japan: SDP. Which, of course, means voting DPJ in most single-member constituencies.
Canada: NDP
Australia: ALP
South Africa: ANC
India: not for any of the parties in the BJP-led coalition. Beyond that, mostly a case of looking carefully at individual candidates...
Poland: I don't know, probably SDPL.
Chile: Socialists
Brazil: I can never remember enough about the various parties to comment for sure. Would have voted for Lula though.
Denmark: Social Democrats
Netherlands: PvdA
Mexico: PRD but would not have voted for AMLO.
...of course in countries where you have to vote for individual candidates, there will always be people in parties I support that I could never vote for.
More interesting, perhaps, is where people would stand on internal divisions within given parties
