Yes, both Pressbase and Zenpost offer a Free Trial.
Pressbase is designed for Individuals, Medium Business and Small Business.
Zenpost is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Pressbase Starts at $39/Month when Billed Yearly whereas for Zenpost Starts at $49.95/Month.
Some top alternatives to Pressbase includes Mynewsdesk, Posted, Superdesk, Speedy Newsletter, Qualified, Workvivo, Blog To Social, Slog, Datanews, Nano, SharpDash and IFTTT.
Some top alternatives to Zenpost includes Posted, Seotagg, TypeJust, TeslaWrite, Qualified, Workvivo, Blog To Social, ContentFly, IFTTT and Surfacer.