This isn't dramatically different from my list over a year ago, but I support I could lightly update it.
Australia:
Australian Labor PartyBrazil:
Partido dos Trabalhadores (Workers' Party)Canada:
New Democratic Party- Alberta: Progressive Conservatives
British Columbia: BC New Democratic Party
Ontario: Ontario New Democratic Party
Manitoba: Manitoba New Democratic Party
Quebec: Québec Solidaire in theory. Parti Québécois in practice.
Saskatchewan: Saskatchewan New Democratic Party
Finland:
Left AllianceFrance:
Parti Communiste FrançaisGermany:
GreensGreece:
SYRIZAIreland:
Labour PartyIsrael:
Israeli Labor PartyItaly:
Italian Democratic Party (There are very few good options here.)
Japan:
Japanese Communist PartyKorea, Republic of:
Democratic United PartyMexico:
Partido de la Revolución DemocráticaNew Zealand:
New Zealand GreensNorway:
Norwegian Labour PartyRussia:
A Just RussiaSpain:
Spanish Socialist Workers' PartySweden:
Swedish Social Democratic Party Switzerland:
Social Democratic Party of SwitzerlandUkraine:
All Ukrainian Union – Fatherland (The options there
suck.)
United Kingdom:
Labour PartyUnited States:
Democratic Party