Growth with Profit. I don't mind growing fast with small margins but dislike high margin but no growth.
Focus on growth and retention with break-even margin.

payment app

zoom alternative. but i didn't understand the key value. How are you better than the existing solution.

startup related blog search engine

trigger-based robo investing

local based social network

Local internet mesh for multiple users.

https://tradeplan.co/

Not sure if mailerlite can be considered as CRM but for now not using any other tool. I use telegram group to talk with my app users.