Moosend has a very favorable free plan (1000 subscribers), but even the higher tiers are affordable. And this software packs a lot of power. High deliverability, drag and drop HTML email builder, lots of integrations, and even workflow automation.
The automation is our favorite part as that separates them from the normal run of the mill email tools.
Check them out and see what you find you like best, Moosend, our Cool Tech of the Week.