Beat to a Pulp publishes one story per week online. The pieces are better than many you’ll find in other non-paying ‘zines, and their editorial team gets good reviews from submitters, largely because they take the time to add that personal touch to about a third of their rejections and apparently they aren’t jackasses about it.
From their Guidelines page: “Our primary focus is hardboiled but we also accept action/adventure, westerns, sci-fi/fantasy, horror/thriller, etc. No yarns with bigotry or overt political agendas.
No more than 4,000 words. Anything longer, please query first.”