i have a list of bookmarks for this, so take your pick of any of the following:

general, not ideology-specific

• Jacobin
• The Nation (US-oriented)
• Democracy Now
• Tribune (UK-oriented)
• Open Democracy (mostly UK-oriented, i believe)
• The Maple (Canada-oriented)
• The Intercept
• Truthdig
• Truthout
• Jewish Currents (Jewish-oriented, obviously)

ideology-specific

• Left Voice (Trotskyist)
• Industrial Worker (anarcho-syndicalist/syndicalist, published by the IWW)
• It’s Going Down (Anarchist)

longer form or more irregular

• Current Affairs
• Dissent Magazine
• In These Times
• Spring Magazine (Canada-oriented)
• Protean Magazine